Tesla owner Elon Musk says that the company’s all-electric Class 8 semi truck achieved a major milestone ahead of a long-awaited customer delivery planned for later this week.

In a November 26 tweet, Musk said that the “Tesla team just completed a 500 mile drive with a Tesla Semi weighing in at 81,000 lbs!”

Musk did not provide any additional information on how long the trip took or whether the 500 mile run was completed on a single charge.

Tesla is offering two versions of the Semi — a standard version costing $150,000 with a range of 300 miles and an $180,000 version with a 500 mile range.

Musk’s tweet comes just days ahead of a planned delivery event to be held December 1 at the Tesla Gigafactory located east of Reno, Nevada. December 1 is the planned date for PepsiCo to begin to accept a delivery of 100 Tesla Semis that the company pre-ordered in 2017.

Tesla reportedly plans to produce 100 Tesla Semis by the end of the 2022 and 50,000 electric semi trucks per year by 2024.

Subscribe for top trucking news updates