Well, I went back in time to have a look at my Model 3 LR delivery process and I can confirm the push back in dates are normal day by day. Its just a matter of patients before the big day comes.
As an exmaple:
"Just watching my delivery date range keep getting pushed back each day at the moment.
Revised estimate was 20 July to 03 August
However, over the past few days the estimated delivery dates have been slipping daily from 20 -> 21 -> 22 -> 23 -> 24 July to 04 August
Hopefully the delivery date range doesn't keep getting pushed back ... Sigh back to waiting patiently ..."
"Random check of Tesla account this morning and there is a delivery appointment date set
27 July!!!"