Boarding Groups when Upgraded

I get updated to Comfort+ somewhat regularly. One time when I was upgraded, it changed my boarding group to comfort plus on the delta app. The other times it has just stayed Main 1.

It’s not a big deal to me, but I was curious, it is appropriate to load with C+ if I know I got the upgrade? Or is that bad etiquette since my digital ticket still says Main 1 boarding group?