I am not sure about a Roku enabled TV but with my Roku Ultra it was necessary to select the 4K HDR feed to get that resolution. I have a Vizio monitor and it allows me to see the resolution.I tried to watch last Saturday's game on my Roku-equipped TCL TV in the Fox Sports app and couldn't figure out if it was the 4K HDR feed or not (likely not, didn't look much better than the 720p feed). Do you have to select a different event for 4K or does it automatically send the 4K stream when it's available if you select the game? Is there a way to check it's 4K beyond the eye test? Based on the Super Bowl FAQ from Fox Sports, Roku 4K TVs should be capable of watching it in 4K