Ephesians 1:21 Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come:
The terms used in this verse are terms used of worldly political rulers (Luke 12:11; Titus 3:1; Ephesians 3:10; 6:12; 1 Peter 3:22).
Jesus, after his resurrection, said:
Matthew 28:18 And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.
Jesus is saying that all power has been delegated to him to enact his Father's will on earth. Only when God's prime objective, to fill the earth with His Glory [see Numbers 14:21, has been fulfilled, will Jesus step down from his exalted office so that the Father may deal directly with His creation. See 1 Corinthians 15:28.
To further your understanding of God's coming kingdom, please read:
The Kingdom of God on Earth ( please click on the title )
I hope you have found this helpful.