What up. Been a Tesla fanboy for like 2 days so apologize if I missed this answer on here. I’m looking at a 2018 model 3 performance with 7k miles. No auto pilot and no FSD. Owner said you can upgrade on Tesla app (3k for autopilot, 7k for FSD). My question is, are these prices totally accurate for this car and not subject to change all of sudden? And also, how long does this retrofit order take to be scheduled and installed if I purchase the car and upgrade, say immediately. Do I have to wait (weeks, months, etc.) for Tesla to get it together and not be backed up?Thx!