Thank you Sam.
To clarify:
When you say “first boot” are you referring to first boot ever into OSMC setup or when the RPi boots and is searching for a SSID?
These are the steps I’ve taken so far:
-I added their WiFi info in the installer
-Plugged in the WiFi adapter then booted the RPi
-Connected to my WiFi to finish all the other setup tasks I needed
Now when I send it off to them and they boot, it will find their SSID?