Psalm 110:1, Luke 20:43 "The Lord said to my Lord, Sit at my right hand, UNTIL I make your enemies your footstool."
Jesus is Lord and sits at the right hand of God the Father Almighty at this time, and the Father has given all things into his hands. So yes Jesus reigns in heaven, but the earth has not been reconciled to his rule completely yet, as evil and hatred still has dominion here, and The Lord Jesus told us to pray: Thy Kingdom come, Thy will be done ON EARTH as it is in heaven.
What the OP is saying is true, Jesus is reigning in heaven and is waiting for his Father to make his enemies his footstool, Earth is the footstool of God and he is still constructing his footstool as he wills. This age is not over yet as is quite evident by observing the world. I believe God is close to finishing his work of gathering all his enemies together for the big showdown and all hell will break loose, but be not afraid because all heaven is coming to the rescue.
Praise be to God the Father of our Lord Jesus Christ, to Him be the glory forever. Amen.