Revelation 20 1 And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand. 2 And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years, 3 And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more, till the thousand years should be fulfilled: and after that he must be loosed a little season.
Point #2 in the article for this thread deals with the above. When he is bound, he will be truly bound.
Since 2 Co 4:4 demonstrates he is not presently, bound, then it is future....as maintained by Rev 19 & 20 it comes AFTER the final battle.