This is SOP for Tesla. They have internal goals and projects all the time. They, for obvious reasons, do not make this information public.
When you place your order, you will be given an estimate of your delivery date, but this is always subject to many variables, many which are out of the control of Tesla.
Currently many auto manufacturers are being blind sided by shortages of items such as computer chips or even stuffing material for seats. It is not Tesla mis-management, but so many things are just not being supplied as promised by their providers.
Tesla usually goes radio silence on all these issues, but all of a sudden they will begin going down the assembly line and into the hands of anxious customers.
Tesla is known for being agressive in production aspirations, but if even one little part is not available the whole car must be delayed.