Honestly a thousand years is as a day to God.
And did not Jesus say you would long to see the Day of the Son of Man and you wont see it?
Luke 17, Did this really already happen? no.
Jesus compares this return as to the time of Noah, when the flood came and destroyed all people, (except them in the ark).
So no its not happened yet, the wicked are still here.
This time is His returning, which Paul also describes in 2 Thessalonians 1.
22 Then He said to the disciples, “The days will come when you will desire to see one of the days of the Son of Man, and you will not see it. 23 And they will say to you, ‘Look here!’ or ‘Look there!’ Do not go after them or follow them. 24 For as the lightning that flashes out of one part under heaven shines to the other part under heaven, so also the Son of Man will be in His day. 25 But first He must suffer many things and be rejected by this generation.
26 And as it was in the days of Noah, so it will be also in the days of the Son of Man: 27 They ate, they drank, they married wives, they were given in marriage, until the day that Noah entered the ark, and the flood came and destroyed them all.
28 Likewise as it was also in the days of Lot: They ate, they drank, they bought, they sold, they planted, they built; 29 but on the day that Lot went out of Sodom it rained fire and brimstone from heaven and destroyed them all. 30 Even so will it be in the day when the Son of Man is revealed.
31 “In that day, he who is on the housetop, and his goods are in the house, let him not come down to take them away. And likewise the one who is in the field, let him not turn back. 32 Remember Lot’s wife. 33 Whoever seeks to save his life will lose it, and whoever loses his life will preserve it. 34 I tell you, in that night there will be two men in one bed: the one will be taken and the other will be left. 35 Two women will be grinding together: the one will be taken and the other left. 36 Two men will be in the field: the one will be taken and the other left.”
37 And they answered and said to Him, “Where, Lord?”
So He said to them, “Wherever the body is, there the eagles will be gathered together.”
Eagles EAT their prey, these bodies are the wicked dead, the great supper of God. The wicked are taken away, swept off their feet, in an instantaneous destruction, (sudden destruction comes upon them). 'if it was warfare of armies, that is not a sudden destruction.
The flood of Noah destroyed all the world, this is not a local destruction, it is world wide.