Where is the Apple TV app on my tv

Select newish TV models support this app. See if your TV model is listed as supported. If it is supported, then it would either be pre-installed or available for download from the TV’s app repository (“App Store”). What is your model TV?

List of Apple TV app-supported smart TVs and third party streaming devices - Apple

Get the Apple TV app or Apple TV+ app on your smart TV, streaming device, or game console - Apple Support

All the ways to watch in the Apple TV app - Apple Support