Both DPD and UK Mail will email you with a 1hr slot on the morning of delivery. Not sure about UPS.
According to some other posts, you'll get a dispatch email tomorrow morning if sent by UK Mail, in the afternoon if by DPD and in the evening if by UPS.
You can also download the DPD app and register your details as it may alert you of the dispatch before Apple do.
Going to be an exciting 48hrs.... 😀