After several delays, Audi’s Q6 E-Tron is finally ready for its reveal. The covers will come off on March 18, and sales should follow shortly after, including here in the U.S. The Q6 E-Tron is an electric compact crossover related to Porsche’s electric Macan, though the Audi should start lower than the Macan’s $80,000 sticker. AC Cars is still…