You can try 'Action Dash'

Edit: It's an app on the Play Store with about the same feature set.

I have a Samsung S9+ so I don't have that yet

Digital Wellbeing is baked into Android 9+ and offers this feature.

The app "digital Detox" punishes you financially if you break your own off time rules, I think. I've personally deleted both messenger and Facebook apps from my phone. I can check it from computer, I don't need it on my phone. Also almost all apps have notifications disabled except sms and phone.

you can use the Desert island app by Google.

Looking for an android app that restricts what time of day I can use other apps