Didnt Jesus really put the frosting on the cake with Matt 28:18 19 & 20?

Yes it is in this present time but remember that in the end Jesus will return all that authority to the Father who will then again be all in all. 1 Cor 15:28 When all things are subjected to Him, then the Son Himself also will be subjected to the One who subjected all things to Him, so that God may be all in all.