Yes, as I see it, Jesus was enthroned at his Ascension.
You can believe that but it is not supported by the Bible because Jesus did not begin to rule as king. For example consider Rev 11:1-14 had not occurred at Jesus ascension then Rev11:15 Also Bible clearly says that Jesus was only sitting at God’s right at that time.
So. clearly he was not ruling as king because if so he would be sitting on his throne in heaven. At that time he couldn’t do that because Satan was there in heaven ( “until I put your enemies as a footstool..” alluding to being cast to God’s footstool, the earth). Jesus’s enthronement is described in Rev 12, later on when Satan was cast to the earth.