I had my first RCS convo yesterday with a friend. Because they were a friend and my sense of them is they value their privacy, I felt it necessary to let them know their read receipts were on. If you find yourself in a similar situation with my friend or if you have a friend who values their privacy and may not be aware of this, I found the article below that explains how to turn this feature off.
How to Turn off Read Receipts in RCS messages for Android Phones