The functioning of the 3rd temple physically is up and running.

It's just a matter of getting things energetically correct for them to be accepted by the world egregore and relevant entities. A small group of Mossad psiop willing to hijack the whole thing out there was enough for legitimacy.

Illustrated:
Anti-Christ in the form of a T-1000 entering the world after the building of the 3rd temple, causing all hostile beings to burn up as they attack him.