If you'd like to use Opal on your iPad, you're in luck! Opal is available on iPadOS 16 and later. To use it, you'll simply need to update your iOS on your iPad here. Once that's complete, you can download Opal here or by searching for Opal on the App Store.
Opal for iPad will walk you through steps to set up Opal. If you already have an Opal account for iPhone, log in using the same account details. Please note that your Settings, Sessions, and Screen Time stats won't be synced or shared between devices, so you will need to recreate any Sessions, App Locks, and App Limits on your iPad. You will also receive see device specific Screen Time reporting on your iPad; you can learn more about how that works here.