Did the 12x24 porcelain tile have an option for a matching bullnose tile for the edge?

That would have been a better solution, but most likely too late to make changes without tearing apart.

Not a great photo, but I used matching bullnose all the way around the edges of this guest shower. I also like to tile the ceilings in my showers.

That is glass? Trim it out as the window in the bathroom is trimmed.

I really hope we can make the bull nose work!