Why can’t I see my iPhone battery percentage

The screenshot indicates that you've had the battery replaced by someone other than Apple or an Authorized Apple Service Provider. Is that what happened? If so, you won't see the Maximum Capacity. The only way to see it again would be to have a proper Apple battery installed by Apple.

Hello ~ If you mean on Lock Screen it is because of the notch If you swipe down from upper right corner you will be able to see your battery percentage on Control Centre page as well as great information from *IdrisSeabright* Plus it seems that your battery was replaced by a none genuine Apple batter at some point according to your screenshot.

~Katana-San~

I don't know. Where are you looking? And, for that matter which percentage are you looking for? The current charged percentage? Or the Maximum Capacity?

What do you see when you go to Settings>Battery>Battery Health>Maximum Capacity?

Why do you assume that I'm a man?