Good afternoon JRK Apple Discuss,
Welcome to the Apple Support Communities!
I understand you are looking for a list of apps that need updates after updating to iOS 13.1.2 or iPadOS. The resource below explains how to do this. I've highlighted some key information here for you. Click on the link for complete details.
Update apps or use automatic downloads
"With iOS 13 and iPadOS 13, apps and games that you download from the App Store are automatically updated by default.
If you prefer to manually update all your apps, you can turn off automatic updates.
How to manually update apps on your iPhone, iPad, or iPod touch
- Open the App Store. If you're using iOS 12 or earlier, tap Today at the bottom of the screen.
- Tap your profile icon at the top of the screen.
- Scroll down to see pending updates and release notes. Tap Update next to an app to update only that app, or tap Update All."
Take care.