I have xcloud on my pixel 4. in UK I am EE 4g and have had a great time playing Cities Skyline and Halo MMC campaign. haven't tried multiplayer games yet, as I see the cross play phone players being the next version of Keyboard & Mouse vs Controller.
I've been an xcloud beta user for a few months, not something that I would use solely, but I have an Xbox controller paired to my galaxy tab s4 and it works really well!