Arriving at St 2/23 and looking at ferry schedules to Tortola.
The current off season schedule shows the latest departure from Stt at 2:30pm.
Is it reasonable to expect later departures in February, say 4pm?

There is a 4:30PM departure from Charlotte Amalie to RoadTown on the current schedule. See https://bviports.org/covid-19.

Starting in November, there is a 5:30 boat too. Here are the latest schedules.

February is not out yet but expect it to be similar these.

They haven't published the schedule that far out. The schedule for the next 3 months has departures for Tortola at 900am, 230pm and 530pm.

Here's October. Just to keep someone from having to ask. 2:30 and 4:30 departures from Charlotte Amalie to Road Town.

For our first 20 years (40 trips) we agonized over the ferry while coming from Manhattan Beach, So CA. thru Miami and never missed a connection. For the next 20 years (40 trips) we did an overnight in St Thomas and leisurely wine and dined before catching a ferry the next morning. Same routine on our return. We are either too old or too smart now. LOL