The toggle will happen each time you reset the phone. Be sure if you reset again to use mobile data for setup, rather than WiFi and you shouldn't have to wait at all.I can confirm a three day time gate on the Moto G Play 2021 I got through T-Mobile Monday. The OEM Unlock has been greyed out since I first booted. Today, Thursday, after the 72 hour window, the toggle became accessable.
At least, that has been my experience with MetroPCS Motorola phones.