How do I delete apps if screen time is restricted on my iPad?

If Screen Time is enabled and deleting Apps has been restricted, then you cannot delete apps until you enable the option again.

Settings ➜ Screen Time ➜ Content & Privacy Restrictions ➜ iTunes & App Store Purchases ➜ Deleting Apps, and make sure it is set to "Allow".

Assuming that your iPad is not centrally managed by an Educational Establishment or Business (as the device may be remotely managed) - if you are experiencing difficulties with adding, updating or removing Apps from your iPad, you’ll need to check your ScreenTime restrictions:

• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Adding Apps - set to Allow
• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Deleting Apps - set to Allow
• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > In-app Purchases - set to Allow

does the (x) appear?