Gday Sinko not sure how familiar you are with the order process so thought I fill in the blanks.
Apologies if you already know all this!
So they should be able to tell you a couple things...
1) Your production build / run number
2) The build / run number expected date offline
Each model Jayco should have a run listed in the Jayco system and they allocate anywhere from 15 - 40 vans of the same the build in one build run. This run gets entered into the system and once full they plan another one and so on. The dealers all have access to this and can tell you from the click of a button how many vans are already ordered in a run and how spots are left in the run before being full This helps if you are still deciding you can see if you don't but money down straight away you may miss out etc.
If they can't give you build / run number this means the run is not in the system yet which means the Jayco factory planning department has not allocated a run to that particular model.
Don't panic though if this is the case as the factory planning team often communicate a run which is not in the system to dealers if there is a high enquiry rate and or fill up rate for a particular model. The dealers then lock this in prior to the run being in the system. This is what happened with us last year.
They do this for all models continually and often have two runs for non outback and two for outback etc so the dealer should be able to tell you which run you are on and they should be able to tell you the expected completion date.
This usually varies by a couple of days at most, in two vans it only slipped one day. From then once the build is complete your van get sent to dispatch and gets sent to your home location. From Melbourne to Sydney mine is usually here in 4 days. Offline on Tuesday in the Sydney yard late Friday. Pickup was a week later

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Either way they should be able to let you know as per the above.
Now the waiting game ensues!
Good luck!