“all authority” was given to him in heaven and on the earth (Matthew 28:18)...
He ascended to the right hand of God and assumed joint rulership of the cosmos as the Lord. First Corinthians 15:24-28 describes this present dynamic relationship.
“Then cometh the end, when he [Christ] shall have delivered up the kingdom to God, even the Father; when he [Christ] shall have put down all rule and all authority and power.
For he [Christ] must reign, till he [God] hath put all enemies under his [Christ's] feet.
The last enemy that shall be destroyed is death.
For he [God] hath put all things under his [Christ's] feet. But when he [God] said all things are put under him, [Christ] it is manifest [obvious] that he [God] is excepted, [God is the only exception] which did put all things under him [Christ].
And when all things shall be subdued unto him, [Christ] then [not now, but at some future time] shall the Son also himself be subject unto him [God] that put all things under him, [Christ] that God may be all in all."
All of this was set up a very long time ago and it will not change because of the solid principles it's based upon. The Scripture fits perfectly, reason is preserved, God is glorified, Christ is magnified, and the individual Christian can enjoy the benefits both now, and throughout all eternity.