Procreate

Try the following solutions: 

1. Check your WiFi connection. If you're using cellular data or WiFi and having issues with app downloading, try to connect to different WiFi network. 
2. Try deleting the app then restart the app download. 
3. Restart your iPhone, then go to the App Store and redownload the app. 
4. Check and manage your iPhone storage space. Maybe you don't have enough storage space on your iPhone which is why you can't download or update apps. 
5. Try signing out of the App Store then sign in again 

If the following solutions above did not fix your problem, try to reach out to Apple Support. 

Hope it helps! 

If that is the case, you need to wait for it.