Minor & Major & None
There are three general viva outcomes.
Minor corrections are minor: correcting typos, editing for clarity and amending diagrams. Most candidates are asked to complete minor corrections as a result of the viva.
Major corrections are unlikely: they account for very few viva outcomes proportionally. Requests from examiners are clear and if completed they still result in success and passing the PhD.
Getting no corrections is nice: of course! But it’s also only something that you can hope for. It’s worth acknowledging that writing is hard, writing a book is very hard and examiners spotting no typos or other corrections is unlikely.
Three outcomes. All, subject to completing any requests, result in success.
Rather than hope you’ll get through with none expect that you’ll have work to do and plan for when and how you will do that work after your viva.