Matthew, Mark and Luke write about The Olivet Discourse in their Epistle. John writes about The Olivet Discourse NOT in his Gospel Epistle, but in The Book of Revelation. Matthew 24 is shown IN Revelation.

Many miss this point and forget a "Coming" would take place at the Destruction of Jerusalem and the fall of the temple. Matthew 24:3 confirms it. A "Coming" would take place before the Mosaic Age came to an end.

The Olivet Discourse is a private conversation between Christ and His Disciples.

It was for and about THEM THERE THEN.
Not US HERE NOW.