How do I watch Apple TV on my smart TVs? I have it on iPhone

If your smart TV supports the Apple TV app, then you can download that and sign in with your account.

If your have a streaming device for TV that supports the Apple TV app, then you can use that and sign in with your account.

All the ways to watch Apple TV+ - Apple Support

Watch on your TV

Apple TV (4K, HD, and 3rd generation) ﹥

Streaming devices ﹥

Smart TVs ﹥

Gaming consoles ﹥

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

If your TV is AirPlay-enabled, then you can stream from your iPhone to the TV.

List of AirPlay 2-enabled smart TVs - Apple