Daniel has just seen Jesus. There are several reasons I say that:
// The phrase “like a son of man” says “human, but…” maybe more than human
// The fact that he came “on the clouds” suggests divinity. In the Old Testament, clouds were often associated with appearances of God.
// Then there’s the fact that Jesus used the phrase “son of man” to refer to himself. At certain points, he also borrowed some of this imagery from Daniel 7.