I'm in the same boat as you. I ordered one last week and my order still states "Pending" as well. I reached out to them and they've told me there's one allocated to me. Let's see and unless it states, "Shipped", I won't believe it.
If you're close to Fresno, Ca. These guy have stock.
https://www.sportsmans.com/shooting-gear-gun-supplies/shotguns/benelli-m4-tactical-semi-automatic-shotgun/p/1100263#smw_turnto_reviews_title