The key point of Ascension is not that the Son of God has begun to rule. The Son of God has, with the Father and Spirit, ruled all things since the beginning of things. The new thing that happened at the Ascension of Jesus is that the Incarnate Son begins to rule. There is a human being, a man, on the throne at the right hand of the Father, far above all authority; by the ascension, Jesus has fulfilled the original Adamic commission to rule the earth.
And we are in Him. Paul says that just as Jesus is seated in heavenly places, so also in Him we are seated in heavenly places.
—Peter Leithart, “Eucharistic Meditation on Luke 22:29,30“