Frequently, there is a problem with your Apple ID when apps on your iPhone are delayed downloading or waiting.
Your iPhone's apps are each associated with a unique Apple ID. Apps could become unresponsive if there is a problem with that Apple ID. Typically, logging out of the App Store and back in will solve the issue. Check to see if your iCloud storage is full by going there. The apps could not be included in this iCloud backup, let alone be transferred to your new iPhone, if your iCloud storage is full. To view your available iCloud backup on your previous iPhone, navigate to Settings > [your name] > iCloud > Manage Storage.
Learn more about storage here-
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