Yes they do, we booked 10 am, we saw whales up to the entrance, if you want to be at the start of the glacier book, later say 11.30, they do not start to enter until 1 pm. If you have an inside room, note people stake areas out early so having brunch you will not see the end of the glacier as it gets there around 2.30, and you will find good viewing gone. If you have a verandah there is no issue.