How to view icould messages
How to view deleted messages
iPhone 13, iOS 16
Question marked as
Sorry, you cannot view iCloud Messages before or after they are deleted. See the following from Use Messages in iCloud - Apple Support
You can use Messages in iCloud on your iPhone, iPad, iPod touch, Apple Watch, and Mac. For your privacy, Messages in iCloud is end-to-end encrypted, which means you can't view or access Messages online via browser.