I have the S20 ultra, been on it for a while now. It's on 5G every where I go, and yes I'm getting good battery life on it. Though I should have waited a week and got the V60, oh well.
Well I picked up the S20 ultra 5G from sprint store, my V50 wouldn't sign on to 5G as of last week, but was on tmobile bands. The S20 ultra primarily using tmobile frequencies, 2,4,12,66,71 so far.
When its'on LTE, it says LTE, when it's on 5G, it says 5G, my phone is on 5G in the DC area. I know the difference, especially when I'm getting a ping less then 25ms
It was a few days for me when it came back, they are doing some tuning I guess, you can do a profile update if you wish, but just give a couple of days.