The longer Iran lets those missiles remain out in the open, the longer they are vulnerable to pre-emptive attack by Israel and the U.S. So Logic dictates that the launches would begin right at the NOTAM time, which is 2:30 AM in Iran, and 7:00 PM (Tomorrow, Sunday) on the US East Coast..
Word on Intel Circuits is claiming that Iran has already pre-positioned one-thousand, five-hundred (1,500) missiles for launch, but later, more recent Intel is now saying the total number of missiles distributed from storage is about four-thousand (~4,000.)
Israel has said "If Iran attacks, they will get double in return."
It is not known if Israel has such ballistic missile resources; generally the Israelis rely on aircraft to attack other countries.
Poster Comment:
NOTAM is Notice to Airmen, Notice to Air Men.
Israel might have 1% of the number of first rate missiles that Iran has. But Iran's targets are underground.