What Your Supervisor Can’t Do
They can’t find all your typos when you ask for feedback on a thesis draft.
They can’t tell you what questions you’ll get at your viva.
They can’t know what your examiners will or won’t like.
They can’t see ahead with absolute certainty about the level of corrections you’ll need to complete.
And they can’t take over for you in the viva!
What they can do is continue to support you. They can give you feedback. They can give their opinions on the viva: the process, expectations, who your examiners are and what they do. They can talk about common questions and offer advice.
They can encourage and support and send you on your way – to do what you need to do at your viva.