Can Jesus return tomorrow or even today? Or are there certain events that must happen first?
He can but I think He'll follow the blueprint God has laid out in the bible as to when He will reveal Himself. God is very specific to reveal certain signs that must take place before Christ comes for the church. The major preceding signs that will occur before He comes listed below will be hard to miss by anyone paying attention to whats happening to Israel today.
Psalm 118:5-28 NKJV
5 I called on the Lord in distress; The Lord answered me and set me in a broad place.
6 The Lord is on my side; I will not fear. What can man do to me?
7 The Lord is for me among those who help me; Therefore I shall see my desire on those who hate me.
8 It is better to trust in the Lord Than to put confidence in man.
9 It is better to trust in the Lord Than to put confidence in princes.
10
All nations surrounded me, But in the name of the Lord I will destroy them.
11
They surrounded me, Yes, they surrounded me; But in the name of the Lord I will destroy them.
12
They surrounded me like bees; They were quenched like a fire of thorns; For in the name of the Lord I will destroy them.
13 You pushed me violently, that I might fall, But the Lord helped me.
14 The Lord is my strength and song, And He has become my salvation.
15 The voice of rejoicing and salvation Is in the tents of the righteous; The right hand of the Lord does valiantly.
16 The right hand of the Lord is exalted; The right hand of the Lord does valiantly.
17 I shall not die, but live, And declare the works of the Lord.
18 The Lord has chastened me severely, But He has not given me over to death.
19
Open to me the gates of righteousness; I will go through them, And I will praise the Lord.
20
This is the gate of the Lord, Through which the righteous shall enter.
21
I will praise You, For You have answered me, And have become my salvation.
22
The stone which the builders rejected Has become the chief cornerstone.
23 This was the Lord's doing; It is marvelous in our eyes.
24 This is the day the Lord has made; We will rejoice and be glad in it.
25 Save now, I pray, O Lord; O Lord, I pray, send now prosperity.
26
Blessed is he who comes in the name of the Lord! We have blessed you from the house of the Lord.
27 God is the Lord, And He has given us light;
Bind the sacrifice with cords to the horns of the altar.
28 You are my God, and I will praise You; You are my God, I will exalt You.
From verses 10-12, it speaks of a prophecy in which Israel is involve in a war against enemies from all sides. We are at that time right now when Israel is on the brink of war with it's immediate surrounding neighboring countries: Hezbollah from the northwest, Assad's regime from the northeast, Hamas from the west at the Gaza, the Palestinians from the east, and currently Israel and Egypt are in an alliance secretly fighting ISIS in the Sinai peninsula in the south.
This war is Israel's final war that will eliminate her enemies in the immediate surround countries that shares a common border with Israel just before Daniel's 70th week commences and a prelude to Ezekiel 38-39 that will occur in the tribulation when Gog and his army will invade at a time when Israel is living in peace.
In 2019, Israel Faces Dangers on Many Fronts
https://www.algemeiner.com/2019/01/02/in-2019-israel-faces-dangers-on-many-fronts/
MILITARY AFFAIRS: CAN ISRAEL HANDLE A MULTI-FRONT WAR?
Military Affairs: Can Israel handle a multi-front war?
Official: Israel army preparing for war on six fronts
Official: Israel army preparing for war on six fronts
Israel to escalate efforts against Iran on all fronts - TV7 Israel News 21 12 18
Further escalation on all fronts - This Week in 60s 16.3.19
From verses 19-22, Israel begins construction on the 3rd Temple. This will happen sometimes either during the war or immediately after the war and the coming Israel-Palestinian Peace Treaty.
When the construction begins, nobody in the world will miss witnessing this major event. It will be like May 14, 1948 when the world saw a nation born in one day. It'll be all over the news, an event no one will miss.
If the article below is accurate and Israel retain sovereignty over the Temple Mount, nothing will stop them from building a 3rd temple, immediately.
Israel would retain sovereignty over the Old City and its immediate environs, the Temple Mount and the Western Wall, but it would be administered together with the Palestinians, Jordanians and perhaps other countries.
Trump peace plan: Divide Jerusalem, Palestinian state on 85-90% of W.Bank
In verse 26, Jesus returns coming for the church.
Blessed is He who comes in the name of the Lord!
The construction of the Temple precedes the return of Christ. When you see it, then it's imminent.
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The Psalm 118 prophecy of Israel's next war with her bordering neighbors is also confirmed in Isaiah 26. It reveals Israel at war and will be victorious and will expand her borders in all directions - a war on all fronts. After the war, Jesus then comes to rapture the church and Daniel's 70th week commences.
Isaiah 26:12-21 NKJV
12
Lord, You will establish peace for us, For You have also done all our works in us.
13
O Lord our God, masters besides You Have had dominion over us; But by You only we make mention of Your name.
14
They are dead, they will not live; They are deceased, they will not rise. Therefore You have punished and destroyed them, And made all their memory to perish.
15
You have increased the nation, O Lord, You have increased the nation; You are glorified; You have expanded all the borders of the land.
16 Lord, in trouble they have visited You, They poured out a prayer when Your chastening was upon them.
17 As a woman with child Is in pain and cries out in her pangs, When she draws near the time of her delivery, So have we been in Your sight, O Lord.
18 We have been with child, we have been in pain; We have, as it were, brought forth wind; We have not accomplished any deliverance in the earth, Nor have the inhabitants of the world fallen.
19
Your dead shall live; Together with my dead body they shall arise. Awake and sing, you who dwell in dust; For your dew is like the dew of herbs, And the earth shall cast out the dead.
20 Come, my people, enter your chambers, And shut your doors behind you; Hide yourself, as it were, for a little moment, Until the indignation is past.
21
For behold, the Lord comes out of His place To punish the inhabitants of the earth for their iniquity; The earth will also disclose her blood, And will no more cover her slain.