Chassis bearings likely will be serviceable for at least a little while with no attention, but will likely die an early death. If transport is needed now, just flush out the motor, change oil, and ride. If time allows pull all wire harness connectors apart, clean, pack with dielectric grease, and put back together. Frames don't rust out very easily on modern stuff, so not a huge worry. It's mostly motor internals, chassis bearings, and electrics that'll be unhappy.
Most all moto batteries are sealed AGM units and probably won't have got much if any salt water in them. I think chances of explosions, etc., are very unlikely. I suppose it's possible that if the water were salty enough to be quite conductive that it could have drained the battery by shorting it out if the terminals were submerged.