Don't just look at the indicator on your phone though. Providers are free to scheme with those. Some honestly show the icon when you are on 5G. Others use the option of showing it when you are on 4G (not even 5G NSA) but the network offers 5G on the cell.
The marketing guys got involved with this indicator and completely ruined its trustworthiness.
It has been going between 4G and 5G today while hiking, so if they lie it isn't all the time at least.
But what do you suggest instead (on Android, a Pixel specifically)?
I've been away from Twitter phone nerds scene for quite a while, what do they use now for those details? Is it still ##service## or something else entirely?