If you (have time to) read the many hundreds of posts on this forum about delivery durations, you’ll see a very mixed picture from weeks to months to go through build and delivery. The other thing to say up front is that until your dealer tells you that your production slot is confirmed (usually a couple of weeks prior to the build), nothing is nailed on. Your build could easily move further forward (or backwards!) as factory and supply chain conditions change.
From my personal experience, my dealer informed me in mid November that the build was scheduled for the following week (last week of November) and it would take 3 weeks. This turned out to be accurate and by 15 December it was reported as built. The dealer has confirmed a couple of times to expect a pick up date in early January, so that looks like a further 3 weeks for transit at the most optimistic. I’ve not read many posts with a better timing than this, but there have been a few when a van seems to have just appeared at the dealer without warning.
My calendar has Week 22 starting 30 May. If the build does start then, it would seem to me (and I’m not claiming any expertise here) that on the balance of probability you may not see the van in June. However, I would have an open conversation with your dealer, on the delivery scenarios, and what this means to you. If you had a mind to for instance, it might be possible to reduce options etc to bring it in budget? Depends how wedded you are to a new CalI and the spec you’ve gone for.