From reading on here, bukato, I understand there seems to have been a bit of a supply issue in recent times.
Hopefully, you'll be at the front of the queue by Monday, but if not, maybe a call to the help line could be useful to ensure there hasn't been any other sort of hiccough along the way.
I ordered 4 on Friday using the phone line as couldn't get the website to work properly. They gave me the usual spiel on delivery. No mention of a delay but time will tell.
I had to phone in an order and was on the promise of two replacements. Then my order when on hold despite the payment going through. Only just picked. No word on the two replacement sensors..