Last year I looked into it but as stated by others, you couldn't start the feed for any of the Sunday games until after the Sunday night game ended. That is way too long after the Bills have typically concluded their game for me to avoid all media so as to be able to watch it without already knowing the outcome.
However, I looked it the NFL Game Pass FAQ the other day and I believe it says that all the early and late afternoon games can be viewed as soon as the later afternoon games are done. Still less than ideal, but that is definitely better. Hadn't been able to find a price yet, though, just the free trial link.