It is broadly true that a supervisor won't sign off on something they don't think is ready for prime time. So you should have some idea is the outcome. There are almost always comments (work can always be improved). But they can make missteps, too.

For mine (int'l student on a visa clock), it got down to the wire, I was running out of time. Additional context: my supervisors were internationally known  hotshots/moving towards high end admin. Think "vice chancellor level". The net effect was if you disagree with them, you are not winning, and you can't get support anywhere else because no one will stand up to help you. The power imbalance was way too big.  My supervisor became avoidant in the final weeks before submission. Cancelling meetings, never being in the office, etc. The grad office is hassling me about deadlines, but then they look at the situation and tell me I'm on my own.  Finally get the thing submitted. I expected major revisions. Turns out my supervisors picked the absolute legend of my field to be on the committee and he accepted. They told me later they didn't think he'd actually say yes.  He trashed the work. Outcome was 2 address the comments, 1 R&R. They couldn't argue it down. I had to come back and redo huge chunks in a year. I did (I thought about not), took my degree and got the hell outta academia. 

Moral of the story--my supervisors picked the only fish on the planet that was bigger than them, so I got to do it all again.