Expect to succeed at your viva. There’s a variety of experiences, but this one is very, very common.
Expect your viva to last hours. Expect your examiners to be prepared. Expect that you will be challenged by the process. Expect that you will be asked to complete corrections as well!
The vast majority of viva candidates pass. You can only get to thesis submission after years of work, guidance and development. Your research grows because you grow. You make something good in your thesis because you yourself are good at what you do.
Expect your viva will be difficult but expect that you will succeed.