They’re there, in your thesis. It’s “when” rather than “if” you see them. When you find mistakes after submission there’s not much you need to do. Correction time will come.
Highlight mistakes if you want to, underline them or make a list if that’s helpful. All of these approaches could be useful so long as they’re not a focus for your preparation or a distraction from the viva.
Personally, I like lists: a list of changes gives you a starting point for correction time. Your examiners may end the viva by giving you a list of what changes they think will help; share yours then if you like, but don’t start your viva by showing your list!
Saying, “Here are all the things I know I need to change,” while honest, may not be the best opening for the discussion…