Do u have to have WiFi to restore from back up
Do you have to have Wi-Fi to restore from a backup after the fact reset phone
iPhone 8, iOS 13
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From iCloud, yes.
From a Mac or Windows backup, no.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
From the above, emphasis added:
Stay connected and wait for a progress bar to appear and complete. Depending on the size of the backup and the network speed, the progress bar might need a few minutes to an hour to complete. If you disconnect from Wi-Fi too soon, the progress will pause until you reconnect.