On my iPhone 11 with iOS16 it will not work
iphone 11 won’t show battery percentage in iOS 16
Question marked as
See the following from Show the battery percentage on your iPhone or iPad - Apple Support
iPhone XR, iPhone 11, iPhone 12 mini, and iPhone 13 mini don't display battery percentage in the status bar.
But you can view int in Control Center or you can add the Battery widget to your Home Screen.