The Semi is amongst the most anticipated Tesla vehicles, likely in second behind the next-gen Roadster, which is supposed to be able to fly temporarily thanks to SpaceX cold-gas thrusters. However, the Semi has been subjected to numerous delays due to battery shortages, as the Semi requires a vast number of EV cells due to its size. Tesla was ready to begin production in mid-2020 but eventually decided to wait after the demand for the company’s mass-market vehicles skyrocketed.
The delays have not stopped businesses from requesting the truck for their fleets, however. Tesla has orders from PepsiCo. and Karat Packaging, a manufacturer of environmentally friendly, disposable foodservice products.
Keep on rocking in the Free World! Still my favorite silly, constructive song.
Eideard 
(Oct 20 2021): “The Tesla Semi has a capacity of 80,000 lbs (36,000 kg) and if its claimed range of 600 miles is proven, it would become the winner in long-haul journeys. “If you want, for long-range trucking, you can take the range up to, we think, easily 800 km (500 miles), and we see a path over time to 1,000 km (600 miles) range for an heavy duty truck,” Musk was quoted as saying by Electrek.
He provided additional specifics. He claimed that the electric Semi would cost 20 ¢/mi (12 ¢/km) less to operate than a diesel truck if charged at a Megacharger, where Tesla would guarantee a price of 7 ¢/kWh (in the United States). If the Semi is not charged at a Megacharger, the savings would depend on the cost of electricity; the high cost in California, for example, may eliminate the operating cost benefit.” https://www.torquenews.com/15475/long-wait-tesla-semi