I'm really not sure. A/Z plans don't really apply to me but I imagine they'll be, at most, in neighborhood of $2k under invoice. Best you can do is call around to different dealers...I'm with Granger Ford in Iowa, reserved on a MY22 at their advertised $2k under invoice. I know of 2 under...
CORRECTION, and my bad. A dealership near Philly was (maybe is) offering 4% under. Chapman Ford of Horsham.
https://www.bronco6g.com/forum/threads/4-under-invoice-at-chapman-ford-of-horsham-starting-03-20-21.13960/
Gamecock is right. (I really wanted to type that.)
If you search through this site you'll see dealerships offering below invoice. Just be sure to sniff out what extra charges they put on when you sit down with them but if you're starting at $4k or $2k below invoice, that's a mighty fine...