About 2 weeks for me between notice and shipping.. When I called Rivian about it about a month ago they are saying there are some issues with the third party being able to make them fast enough so they are coming in batches.
A gauge that shows the 12 volt battery charge. If the 12 volt goes dead the truck bricks. Learned this first hand, so a voltage monitor would be a welcome heads up. Would fit perfectly into the new vehicle monitoring screen that shows the altitude and engine temps.