As per https://www.reddit.com/r/macbookpro/comments/r8wnnz/preorder_and_shipping_megathread_macbook_pro_late/
Seems any order outside the standard 14"/16" 16GB RAM is delayed for resellers - some dating back to November! Direct orders from apple.com seem to have gone uninterrupted.
Is apple sacrificing the resellers to maintain its M1Max/RAM stock for Mac Studio/new products?