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Google Messages just flicked the switch on end-to-end encryption for all RCS and group chats
(chromeunboxed.com)
This is a most excellent place for technology news and articles.
Name, service start date, last seen date, IP address, and email address, that's it. Proof here. Everything Google and Apple also collect. If that's a problem for you use Signal, not iMessage.
I get that, but Meta/Facebook has a massive track record of not giving a shit about its users. I wouldn't recommend trusting them, they've shown their true colors many times over.
You don't have to trust them, you shouldn't trust any of them, but your messages are encrypted nonetheless