Will Israel institute Sabbath worship in the rebuilt temple?
Yes. The context states that religious Jews have almost mandated a return to Sabbath keeping, and everything is being set in place for this. Before too long Israel will have the temple, and in that temple worship they will institute the Sabbath day, shutting down entertainment and business to establish it.
Les teaches that secular Jews want nothing of it, but the religious Jews have almost mandated that they must go back and keep the Sabbath. He explains that everything is getting set, even in the nation of Israel, where before too long they will have the temple, and in temple worship they will institute the Sabbath day. That means they will shut down all their nightclubs, movies, places of entertainment, and business; they are going to establish the Sabbath. Present-day Judaism limits how far one may walk on the Sabbath to about a mile or a mile and a half, but Jesus references this because the coming flight will require going many miles; He says to pray the event does not happen on a Sabbath, just like leaving Israel on the night of the Passover. Les also notes the exodus from Egypt had to be miraculous, and he expects the same at the midpoint of the Tribulation when Jews in Jerusalem realize the one they trusted becomes their mortal enemy, with a tremendous earthquake in chapter 11, leading them to congregate and flee Jerusalem as a mixed remnant escaping.