If they are not off Tortola by now ferries are no longer an option.
USCG has declared USVI ports under Condition Yankee:
Closed to all commercial traffic.

Ferry Service between Charlotte Amalie Harbor, St. Thomas and Tortola BVI
•Smith Ferry’s last departure today will be at 3:30 p.m.
•CME Fast Ferry’s last departure today will be at 4:15 p.m.
There will be no further departures from downtown Charlotte Amalie to Tortola until the ports have been reopened by the USCG.

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Ferry Service between Charlotte Amalie Harbor, St. Thomas and St. Croix, USVI
•The ferry service between St. Thomas and St. Croix is not operating.

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Ferry Service between Urman Fredericks Marine Terminal, Red Hook and Tortola, BVI
•Interisland Boat Services’ last departure today will be at 4:30 p.m.
•Native Son’s last departure today will be at 5:00 p.m.
There will be no further departures from Red Hook to Tortola until the ports have been reopened by the USCG.