Two timely catalysts could lift Tesla's quarterly deliveries above expectations.Shares of Tesla (TSLA 3.97%) have been volatile into quarter-end, with investors fixated on next week's delivery report. The electric-vehicle (EV) maker sells mass-market cars like the Model 3 and Model Y, plus premium vehicles including the Model S, Model X, and Cybertruck. The near-term debate is whether third-quarter deliveries can top expectations after a softer first half of the year.There is a credible case for an upside s ...