Does that mean I’m good to go ?
By your screenshot, Wi-Fi Calling appears to be set up. Since there’s cellular signal showing and to temporarily simulate a no-cellular signal condition, turn on Airplane mode. Wi-Fi should remain active, as should Wi-Fi Calling. To be certain that it works, make a test Wi-Fi call. If it works, then you’re good to go! Remember to turn Airplane mode off.
If you’re not able to place a Wi-Fi call, try powering off your iPhone8, then power back on. Check to see if the ‘Enable VoLTE’ option appears on the Voice & Data screen. If the option is still not visible, there is the possibility that VoLTE access may not have been provisioned on your account. In that case, schedule a callback through Koodo Assist. In the chat box, type ‘schedule callback’. A rep should be able to provision the account for VoLTE access. The option to enable VoLTE should now be visible.
As a side note, if you cannot rely on your phone for a callback due to poor signal strength, I would suggest downloading the Fongo Mobile app. The app works over Wi-Fi or mobile data and is available for iOS and Android devices. You will get a free local phone number that can be used when scheduling a callback.
Fongo Mobile app