My inventory car that was in the inventory on 10th October is being delivered today... But then again I don't remember if it said it was available for immediate delivery.
Howver, given that there was a shipment that arrived in the UK just a few days ago, it's likely there could be some cars available right now. Probably your best bet would be to call your nearest Tesla showroom or service centre and pick the "sales" option to check before purchasing.