Just install the watch face on the watch don't need the phone

Animated HD Digital Watchface (12/24h format based on phone or watch setting)
Stylish, Clear & Battery saving watchface for wear os smartwatches with digital time, Heart rate measures - please note that the heart rate BPM could not work properly on certain Wear OS devices (tested and working on Samsung Smartwatches), Steps counts, Calendar, battery level, date, and High-quality definition

Features:

-Animated HD theme
-HR rate measures - please note that the heart rate BPM could not work properly on certain Wear OS devices (tested and working on Samsung Smartwatches)
-Digital time (12/24h format)
-AM/PM indicator (for 12h format)
-Battery percentage with evolutive battery icon
-Calendar on the always on display
-High-quality definition
-Hyper realistic watchface
-Support Always On Display (AOD)
-Battery saver