I believe that Christ is reigning, just as he said he would. He said that His was a spiritual kingdom. He also said that He was coming back, I believe that He will. He said he would deliver the kingdom to the Father. Why would we put our hope in living in this world, He clearly has something bigger planned. 1000 is meant to be literal
There's nothing in Scripture that would preclude Him from ruling and reigning in some physically mannifested way from this globe and a LOT of Scriptures indicating He will.
HE wrote it.
HE'S THE BOSS.
It's HIS script.
IT'S HIS gig.
IT'S HIS MANDATE.
It's HIS pleasure.
I'm HIS SERVANT.
EVERY KNEE SHALL BOW; EVERY TONGUE SHALL CONFESS THAT JESUS THE CHRIST IS LORD OF LORDS AND KING OF KINGS.
I suppose we could speculate about spirit knees bowing and spirit tongues confessing.
And, I've often wondered about how we'll be doing out part in glorified bodies as other Believers who've lived through/come out of The Great Tribulation will be doing their part in mortal bodies . . . But I'm enormously confident that God has that ALL WORKED OUT.