Hi, I'm not sure if you will be in hospital the following day or not ... or what your phones are like in hospitals over there; but after my surgery I phoned my T (we'd agreed on that before hand) and that way he didn't interupt doctors or nurses or anything else going on in the hospital by phoning me; although of course if you are home then that wouldn't be an issue

Either way ... you can ask if either your T can phone; or why not ask if you could phone your T if you have other pre-arranged calls? that way you can check in with your T and let her know how everything went ... I know the phonecall I made to mine following surgery helped me
I hope everything goes well with the surgery itself