I found this post on another website
“Feb 9, 2022
If it’s helpful to anybody: Ultimates [and highlanders for the aussie market] ordered between November 6th and sometime in December went into production this week so for those orders we’re looking at 10 weeks. (Assuming 2 weeks from Tilbury to dealership)”
I have received confirmation that my order, which falls within the timescales above, is at the build stage. April delivery is a possibility, depending when and how often the cars are shipped.