While they are not yet Roon ready, there has been a lot of chatter of late about Denon/Marantz products (including some AVR’s) appearing as ‘uncertified’ Roon Ready endpoints in users systems with the implication that they are undergoing certification.
You will not be able to get any details on timelines (or, indeed, details of which products are undergoing Roon Ready certification), but if any Denon/Marantz products are of interest, it may be worth waiting a while before choosing.