I did not find any of the settinngs or categories of settings listed above, but in looking at my apps section, it seems like two applications are installed, but none were done by me. I flipped back and forth between the two, setting them as default. When I looked back at my wife's messages, the very last one (only) showed "read", so maybe it will start working for future messages.
Danny
Ok, I had my wife send me another text. I am now getting notifications as on my Note 8, such as "sent", "delivered", "read", etc., whatever they might exactly be. Toggling between the apps and setting them as default then going back to the original app, then setting it as default did it.