We are picking up additional crew on Day 4 of our charter and need to let them know where to go so we can pick them up

We are thinking of heading to Soper's Hole in the morning. They are scheduled to land in STT at 12:35 and hoping they can be on the 1:30 ferry to West End. After we get them we want to head to Cane Garden Bay for the night. How early do we need to get to CGB to get a mooring ball? Our thought is that if they don't make the 1:30 ferry we will head to CGB w/o them and have them taxi to us there. Is that a good plan? We want to re-provision at Soper's as well.