The Jost ferry is running from St. John. But, it only returns to Red Hook. You can take the people ferry back. There will be taxis at the ferry dock to go to White Bay. The ferry returns a bit later on Weekends. I use vinow.com for ferry schedules - https://www.vinow.com/travel/virgin-islands-ferry-schedules/jostvandyke/

Cheers, RickG

S/V Echoes, 2003 Beneteau 423
Grenada