If you purchased a PRECISION 3+ Powermeter, it will come with Apple Find My already enabled. If you are not sure which power meter you may have, here are the indicators that your power meter has Apple Find My:
Firmware version: The Apple Find My feature is only available on firmware version 2.3.0
Find My etching: Every Apple Find My enabled power meter will have the below physical etching on the side of the power meter pod.