Just to share I also ordered a 350H premium pack with link-pro end of Nov through a lease company, was given an estimated date of 10th June, only slippage reported by a week to mid June. To be fair I'm untrusting of the date and have been pushing for a build date as for me thats the only way to accurately estimate, 10-12 weeks after I'd guess.
Chased again today and Lexus replied with this to the lease company 'With regards to this one the TGB system still states an ETA of the 14th June although a vehicle has not yet been allocated. The current supply update states June/July for a new order so I would say estimated late June to your customer '
I have no idea if 'allocated' has any bearing on build status - if I were a betting man I'm waiting for a new slipped date next week.
On a side note - I know this is a US based video tutorial but you may find it interesting on the new NX 😉