I posted a thread about this and it went unanswered. The problem with the new stats is that it requires people sharing a lot of data for it to be useful.
For example, in the screenshot you shared, I know your screen time for today, but I don’t know when did you unplug it and what was your percentage when you did. I assume it was 100%, in the morning, but it might not be the case. You may have unplugged it now, or you may have unplugged it two days ago. With that screenshot, I can’t know.
I have tried looking everywhere for some screenshots, and the vast majority of them, I have to guess and get a rough estimate.
What I do for my Xʀ on iOS 12 is the following: I add up hour-by-hour numbers on the battery section, therefore I know the exact screen-on time.
The only way that the Screen Time section works, is if you wake up, immediately unplug you phone from 100% and share afterwards. Anything that deviates from that is an approximation at best from my end.
PS: I have the iPhone Xʀ, not the iPhone 11, that’s why I’m not including my report here.