My understanding on it is this:I believe this means the vehicle has been unloaded at port of entry, cleared customs, and are entered into the RAV database.
Does not even have to be unloaded or cleared customs/quarantine
The car can still be on the ship but the ship its on has arrived at its first Australian port
For example a Melbourne bound car is on a ship which arrived in Brisbane before it heads to Port Kembla then Melbourne. The Melbourne car remains on the ship but appears on RAVS when the ship berths in Brisbane