How can I set my battery to percentage on the home page on my iPhone 11 Pro?

There is no option to have it permanently display on the home screen of an iPhone X or later. You can view it in Control Center by swiping down from the top right corner of the screen.

There is now way to display the battery percentage on the home screen. You can view it in control center or in a battery widget. See this article https://ios.gadgethacks.com/how-to/view-battery-percentage-indicator-your-iphone-11-11-pro-11-pro-max-0208761/

Axel F.