If you can get your GMON from the dealer, then I can provide updates along the way.
Essentially the car goes from milestone to milestone until it arrives at the dealership and is then retailed:
20 = ordered (embryo). Car ordered by dealer or Holden waiting to be picked up for build. (2-3 months out).
30 = preferenced. Car is picked up for build. (2 months out).
32 = scheduled. Build week assigned (last milestone for any changes before it's locked in) (6-8 weeks out).
33 = sequenced. confirmed build date assigned. No more changes can be made at this milestone (6 weeks out).
34 = broadcast. roughly the same as above. Cars go from 33 one day to 34 the next. (6 weeks out).
35 = Body Shop. Car is actually being built. There are sub-events under this that don't show (i.e. 37, paint shop).
38 = Assembled. Car is built. Local builds can then enter the HEC for accessories to be added and can sit at this milestone for a few days.
40 = Delivered to sales. Car is officially built and has left the factory.
4B = Parked at the Elizabeth yard or at Prixcar/Adelaide Rail. Plant stock cars sit at this milestone until picked up by a dealer.
42 = Physically in transit to the state you live. Some cars go directly to dealers by truck, so will skip the steps below.
4B (again) = Delivered to the rail yard in your state.
42 (again) = on it's way to the dealership.
50 = Delivered to the dealer
60 = Delivered to customer.
Hope this helps.