After being on the waitlist for 10 days (joined it the day after WWDC, last Tuesday), I finally got it earlier today!
Was just driving along and found out I had it after seeing the new orb instead of the rainbow border when summoning Siri on my CarPlay screen.
This was at about 1:30 PM my time earlier today and I did see a ready for Siri notification on my phone’s screen but didn’t have to go into settings and tap try new Siri again as it just activated itself!
For those still waiting, hang in there; your waiting will soon pay off!