How appropriate would it be then for the Temple of the 70th Week to have its construction, completion and worship services commenced prior to the advent of the angel Gabriel's prophecy about Israel's 70th Week? I believe the Word of God Himself in the text of the Holy Bible tells us this will be the case.
Therefore, a standing and fully-functioning Jewish Temple on Mount Moriah would be the greatest physical sign of the imminent arrival of the final seven years of human history as we have known it since Jesus' own death, resurrection and ascension into Heaven and the rebirth of Israel in fulfillment of Isaiah 66:8.
John the Revelator writes in the first three verses of Chapter 11 the revelation which God gave to Jesus who made it known to the angel who presented it to John:
"I was given a reed like a measuring rod and was told, “Go and measure the temple of God and the altar, with its worshipers. But exclude the outer court; do not measure it, because it has been given to the Gentiles. They will trample on the holy city for 42 months. And I will appoint my two witnesses, and they will prophesy for 1,260 days, clothed in sackcloth.”"Here is a standing and fully functioning Temple at the very commencement of the 70th Week, upon the Lord's appointing the Two Witnesses to commence their prophesy and ministry for the 42 months (1,260 days) of the first half of the 70th Week.
Look at the grandeur, spectacle and sheer size of the Temple as imagined and scaled to correct proportions above. How long does it take in this era to prepare the ground and layout all of the requisite necessities for the construction of such a Divinely ordained structure such as this? 12 months? 2 years? Three? More?
The point is that a structure such as this will require a schedule and an executable plan to complete. Other religiously ordained things are required to place it into actual service, and they will require a certain amount of time also to complete.
Whatever these unknowns amount to in linear time, one thing is certain, all of these activities will all occur prior to the start of the 70th Week, as well as all of the logisitics which are necessary to make such a construction effort even possible. The Harpazo can occur at any moment, yet there is also the distinct possibility that the Bride of Christ will be witness to the prophetic events, such as the fulfillment of the Psalm 83 war, which are prerequisite events to any of this occurring.
As the text reveals, the "times of the Gentiles" are still in progress when the Two Witnesses begin their appointed and prophetic ministry and the construction and completion of the Temple structure occurs.