Tesla Inc.'s  (TSLA)  Model 3 has passed regulatory production requirements and the first cars will be on roads by July 28, its founder Elon Musk said Monday.

In a series of Tweets, founder and CEO Elon Musk said the Model 3 has passed all regulatory requirements two weeks ahead of schedule and it is "expecting to complete SN1 on Friday," a reference to what could be the first model off the production line.

Tesla is planning a handover party for the first 30 customers on July 28, Musk said, with production growing there should be 100 Model 3s out in August and more than 1,500 in September.