That said I personally would suggest waiting for the 13 since the 12 added two new big things, 5G and Magsafe. Both of which should be much improved in their second generation
Here's my N=1 anecdata, but in 10 years of using a smartphone I have yet to be hacked. I've used iPhones and Android interchangeably, and neither of which felt more secure or private, their vulnerabilities were just spread out across different attack surfaces. You're free to draw your own conclusions here, but "privacy" is a pretty strange reason switch. You're just putting your faith in a different company, which doesn't really improve anyone's condition.
Apple is really good about this. More things are done on-device, and the list of on-device machine learning stuff keeps expanding. Their strategy is very different compared to Google or Amazon.
Take a look at: https://www.apple.com/privacy/
I don't think Apple is meaningfully better than Google in terms of privacy: https://news.ycombinator.com/item?id=26639261.
If you want a private phone, you should consider something else.