The 2024.19 patch notes became visible just a couple days ago. That generally means a handful of vehicles will start updating in 1 week, and if customer service didn't hear any complaints then they'll roll it out to all vehicles in batches over the following 2 weeks.
There is a new iOS Rivian app update that just hit yesterday and the speculation is that is related to getting everything right before 2024.19.xx is released.