I just did it today, and at 180+10, you should be ok. Do it online if you can, so you don’t need to wait on hold. However, someone the other day said that you can’t differentiate between children and adults in the online booking, so if you have children (under 10) in the party then you will probably want to call, so you don’t overpay.
If you do it at 180+10 then I don’t think you will have any problems getting reservations even if you call. Good luck!