There’s a chance you’ll get a test drive in a demonstrator at your nearest GR Centre by mid-November (these cars are getting priority for the ECU re-flash), but you won’t get your car before the end of the month or early December. You can ignore any dealer telling you about mid-November deliveries to their dealership - they are not lying to you, but their internal system does not reflect the current timeframes.
This will depend on when your car came in to Derby and when they can fill a transporter heading in your direction (with any Toyotas, not just GR86s), plus time doing the PDI and any prep work at your handover dealership.
Add in time taken to get any part-ex assessed and agreed, as well as clearing any finance and other applicable paperwork, and I’d say any of us will be lucky to have a car this year.