Here in Columbia, SC, I regularly wave at the few Rivians I see and consistently get friendly waves and smiles back. Maybe from still being fairly new (or a southern thing?). To the OP and her family (and others!) if you make this way I promise to wave :>)
I also agree on the weather app. Seems like it would be a good fit for the Adventure ethos Rivian promotes and I would use it constantly. FWIW there was one on my 2016 Volvo I found very useful.