What app version should be on my TV iPhone and iPad?

For the iPhone & iPad, just 🔍 Search up the app in the app store and tap anywhere on the applicable search result besides the Open or Update hyper "button" to find the app's full-skinny heads-up, wherein you'll find the applicable version under "What's New ＞" and if the Open/Update hyperbutton says Update, hit it.

Similar heuristics should prevail for the Spectrum TV app on any supportive TV device but feel free to share the make, model and OS thereof if you find otherwise and have a mind to.