None of the regional Sunday NFL feeds are distributed in 4K or 1080p, FOX's games are all 720p, CBS's games are all 1080i. The only reason why they use some 4K cameras on the field is so the video is still in HD quality when zoomed in. The actual productions coming from the trucks are not natively in 4K or HDR.
FOX's 4K NFL telecasts are limited to select nationally televised games like Thanksgiving, and those will be available to DIRECTV satellite and internet/stream customers on one of the LIVE4K channels. CBS Sports on the otherhand has yet to produce a 4K NFL telecast or a 4K simulcast of any of their other sports, their 4K coverage have mostly been limited to seperately produced coverage, like the Amen Corner feed for the masters.
Also, DIRECTV has ZERO control over how RedZone is produced, like Jimbo said, their version of RedZone went away when they lost the rights to produce Sunday Ticket, so they will just be passing along the 1080i RedZone feed provided by NFL Network.