It’s not officially late until Sat night/Sun morning switch over, at which point the tracker will probably default to “build in progress” (like it did with the BW33ers at the turn of BW34). If your BW36 car switches on the tracker on Sunday morning, you might want to ring VW UK early next week to see if it has actually been started.
Some BW33 cars were made early on in BW33 – if no BW36ers are getting built in BW36 (as it seems here), then that would suggest to me that VW are more behind in BW36 than they were in BW33 and that they haven’t been closing the backlog in the last 4 weeks since shutdown.
If your actual car build week is a few weeks later than confirmed BW then you might have to pester VW UK to try for “priority shipping”. That might see your GTI/GTD jump the shipping queue over a standard Golf that has only had an order to build wait of 8 or 10 weeks.