My experience in the past is that once on board the ship new excursions are available which were posted as sold out or not even listed before the cruise. Once you get on the ship go to the shore excursion desk and ask for a current list of available excursions. Considering the COVID situation new buses and or time slots may be added during the sailing. Last year we did the Greek Isles on the Getaway and this was our experience. I wait listed on one excursion and was added the night before.