If you are waiting for MODEL S or Model X
Although Model S and Model X are made in the same factory as the Model 3 their delivery journey to you is markedly different.
Both Model S and X are shipped partly assembled in containers (3 to a container).
They are moved by road from the factory to the Oakland Joint Intermodal Terminal where they are loaded on to a train.
The train then takes about 9 days to travel to Houston. (actually BNSF Pearland).
The containers are then moved by road to the dock at Barbers Cut where they are then loaded on to a scheduled container ship that eventually arrives 15 days later in Rotterdam (Note: Although the ships have a scheduled stop in Antwerp your containers are unloaded in Rotterdam).
There the containers are moved by road (or barge) to Tilburg in Holland. Your car is removed from the container and then joins a mini production line where it is reassembled.
It is then moved to Zeebrugge and shipped to Southampton.
As can be seen, all this takes time.
Finding your car in this complex logistics chain is difficult but there is a man who can.
@Vedaprime is the specialist in this area. You can find him here but he normally resides on Twitter.
Ships for possible Model S and Model X shipments are:
MAERSKA IDAHO arrived Rotterdam 17 Aug
MAERSK NIJMEGAN arrived Rotterdam 22 Aug
MAERSK OHIO arrived Rotterdam 24 Aug
SAFMARINE MAFADI arrived Rotterdam 31 Aug
MAERSK MONTANA Dep Houston 23 Aug Arrived Rotterdam 7 Sep
MAERSK IOWA Dep Houston 30 Aug Arr Rotterdam 14 Sep
MAERSK IDAHO Dep Houston 6 Sep Arr Rotterdam 21 Sep
MAERSK OHIO Dep Houston 14 Sep Arr Rotterdam 28 Sep