SpaceX now saying the earliest flight 12 launch date is May 21.
Of the two Indian Ocean ships mentioned, ShipAtlas shows Offshore Supplier underway in a plausible direction to the impact site, but Offore Surveyor has just been moving about near port at Exmouth.
I've not yet spotted the two Booster asset vessels in plausible motion, but they don't need so much time to get where they need to go.