I originally pre-ordered 4 Pro Max set for mid October shipments.
Friday, I decided to check and was able to get 2 phones at my nearest Apple Store. I stupidly canceled my 2 other preorders, and like you said, I've seen no Pro Maxes in stock since Saturday. What makes it worse, I could've easily gotten the other 2 phones if it wasn't the focus on the colour and not making 30+ minute drive.
Seems like the orders I was able to purchase on Friday were most likely canceled orders, its probably going to be tough to get store orders now.