What is the meaning of Daniel 9:21?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

while I was still praying, Gabriel, the man I had seen in the earlier vision, came to me in swift flight about the time of the evening sacrifice.

Berean Standard Bible (BSB)

yes, while I was speaking in prayer, 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 offering.

World English Bible (WEB)

Yea, whiles I was speaking{H1696}{(H8764)} in prayer{H8605}, even the man{H376} Gabriel{H1403}, whom I had seen{H7200}{(H8804)} in the vision{H2377} at the beginning{H8462}, being caused to fly{H3286}{(H8716)} swiftly{H3288}, touched{H5060}{(H8802)} me about the time{H6256} of the evening{H6153} oblation{H4503}.

Strong's King James

While I was still speaking in prayer, the man Gavri’el whom I had seen in the revelation in the beginning was touching me in my tired tiredness about the time of the evening sacrifice.

The F.O.G*

The F.O.G Paraphrase

yea, while I am speaking in prayer, then that one Gabriel, whom I had seen in vision at the commencement, being caused to fly swiftly, is coming unto me at the time of the evening present.

Young's Literal Translation