How will your viva end?
Will your examiners simply say something like, “I think we’ve talked enough,” and then request a short break?
Will they ask you if you have any questions or anything else you want to say?
It’s hard to say how your viva will finish. It won’t hurt you to reflect on what you might say in advance.
A question about developing your work further could make for a short, interesting conversation. Asking about publications or funding opportunities might help you gain the benefit of your examiners’ experience. Or coming back to a point from your research could help you to say one more good thing about what you’ve done.
Reflect a little in advance, then see what happens on the day. The closing moments won’t make or break anything, but they could help you to feel a little bit better or gain a little more knowledge.