Rivian is looking at a potentially major transformation in its business over the coming months.Rivian Automotive (RIVN 0.85%) is expected to announce earnings in early November. If you've been eyeing this electric vehicle stock, now may be a key moment to buy it at a discount. That's because Rivian is about to reach an important growth catalyst. This will perhaps be the biggest in its history. Let's learn what that is and whether now it a good time to invest in the EV maker. Expect important updates to arri ...