Why is my phone saying
Ready for your new iPhone
Your data is ready to be moved to your new iPhone. This iCloud backup will be deleted in 21 days.
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The following Apple article describes temporary iCloud storage. Get temporary iCloud storage when you buy a new iPhone or iPad - Apple Support
I don't know of a reason that you would get that message if you didn't create a temporary backup but I have seen a few other posts in the last month or so wondering about the same thing.