You’re most likely to get minor corrections. Check to see how much time your university allows for them to be completed. Passing usually means, “passing subject to completing these” – so find out the timeline in advance for the most likely outcome and figure out what that could mean for you.
You don’t need to plan for no corrections. If it happens, great! That’s it. Your only bonus is to be completely done probably a little sooner.
You’re least likely to get major corrections, but some candidates do. Doing a PhD is hard, writing a thesis is hard. It’s to be expected that sometimes, despite best efforts, the thesis does not quite match the standard needed even if the contribution is sound. It’s major because it takes more time than minor, because there is more to do. But it’s not a fail, and you shouldn’t expect it for you.
If you do, genuinely, expect to get major corrections then talk to your supervisors about why you’re thinking that. Get a second opinion and explore your options.
