Can I access Apple TV+ on my Sony Bravia smart TV?

Sony has this to say about it:

Can I use the Apple TV app or Apple TV+ app with my Android TV or Google TV? - Sony Support

↳ includes a list of supported models.

It came pre installed on mine. Use the Home button on your tv remote to bring up the page of Apps. Once in the Apple tv App you will need to sign in with your Apple ID first, then click left to bring up the Apple tv menu. Some features may be limited.

If your TV has a Store to download apps, then you should be able to download the AppleTV+ app. It is available on Sony, Samsung, LG, Roku and other TV's, but results may vary by the model.