If you are coming from a Samsung, you will be just as surprised as I was to find out the specs on the Pixel 5 aren't truely accurate.
They say that the 5 has always on display (which is the "screen saver") but it actually only turns on when you are plugged in or docked. This is very inconvenient for someone who wants to know the time discreetly without touching their phone or obnoxiously asking Google what time it is. Navigate to display/advanced/screen saver/when to start and you will see the only options are; while charging and/or docked and never. In my opinion, third party apps don't work as well so if you're accustomed to always on display and thinking about a Pixel 5, you might want to reconsider.