You will not have any access to the car until delivery. The car is not assigned to a purchase order until the VIN is assigned, if then. My dealer could trace the transportation of the car across the country, but the car is in Service mode until delivery, and only Tesla has access. No app access or status thru the app until delivery.
Even after a VIN is assigned, Tesla can, and has, reassigned the VIN to another buyer. The car can be held at Tesla for missing parts due to supply shortages, etc.
The estimated delivery date is mostly what Sales hopes will happen. Recently, the EDD has been extended by months to over a year.