This is critical to understand, because it means the 70 shmitahs of Daniel 9 are not yet complete.
In Daniel 8, within the overall vision that Daniel 8, is a specific vision of the 2300 days of the little horn's transgression of desolation, which Gabriel - himself with in the overall vision - stated was for the time of the end.
In Daniel 9, Gabriel appears to Daniel, but not within a vision like in Daniel 8. Gabriel gives Daniel straight talk in 9:24 regarding 70 shmitahs fortcoming.
It is generally agreed by all here in principle of the events leading up to the messiah cutoff in Daniel 9:26, which we all know to be Jesus. It is the confirming of the covenant for 7 years, what covenant by who, and if those 7 years are history, partially or fully, and if the entire 7 years are left - is where the disagreements are.
So lets look at Daniel 9:21-23...
21 Yea, whiles I was speaking in prayer, even the man Gabriel, whom I had seen in the vision at the beginning, being caused to fly swiftly, touched me about the time of the evening oblation.
22 And he informed me, and talked with me, and said, O Daniel, I am now come forth to give thee skill and understanding.
23 At the beginning of thy supplications the commandment came forth, and I am come to shew thee; for thou art greatly beloved: therefore understand the matter, and consider the vision.
Daniel in Daniel 9 does not have a vision -like in Daniel 7 and Daniel 8, said to be visions in the text and contains elements of metaphoric symbolism, like beasts, horns, he-goats, rams, leopard, bears, lion, etc.
So no vision in Daniel 9.
"Gabriel, whom I had seen in the vision at the beginning" in verse 21. The only vision that Daniel saw Gabriel "in" was in Daniel 8. "at the beginning" is just another way of saying when Daniel first saw Daniel, i.e. in the vision in Daniel 8.
So it is that vision, in Daniel 8. So what part of the vision is specific to the 70 shmitahs (weeks)?
Let's look at Daniel 9:24.
24 Seventy weeks are determined upon thy people and upon thy holy city, to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy, and to anoint the most Holy.
The transgression associated with the vision of the little horn is transgression of desolation by the little horn time of the end. That event spans elements over the course of 2300 days. Nearly 2520 days of a 7 year period.
The 2300 day vision and prophecy dealing with the little horn's transgression of desolation, time of the end.
From that we can know that he 70th shmitah is still unfulfilled. And completion of the 70th shmitah is still ahead. To be completed the day that Jesus Returns.