How do you determine if you're using Wi-Fi or LTE?
There isn't a specific place that it shows, but the WiFi connection will take priority over the cellular data. If you wanted, you could perform a SpeedTest to check your service provider, but that shouldn't be necessary.

Also, if you're worried about updates and whatnot using your cellular, the downloads will initiate on WiFi (if you have that option) but they will continue on cellular if you lose the signal.