Tesla may not be the cheapest EV stock, but at least it's earning a profit.Friday is looking like it's going to be a busy day for investors in electric vehicles, with Rivian Automotive (RIVN 0.70%) and Lucid Group (LCID -0.91%) both having reported earnings last night, and Tesla (TSLA 6.76%) stock reacting to the news from its rivals.Earlier today, Lucid stock was up 6%, though around noon ET it was negative on the day. Similarly, Rivian was up 4.8% earlier but had dipped down to a 0.80% gain. Surprisingly, ...