There is no way to identify edited vs unedited pictures. It's problematic when working on larger projects and I'm sending the pictures to a edited album in batches. Also, you guys got rid of the color labels...so I can't even use that any longer.
Sounds like you may have chosen the wrong application for the type of work you do. Lightroom Classic is probably more suitable for what you want to do. Lightroom CC is a work in progress, and maybe not (yet) suitable for larger projects. Color labels weren't removed, they are one of the many things that have not been implemented (yet).
By the way: You can search for edited/non-edited pictures in Lightroom CC, although I'm not sure this works well. Type 'Edited' in the search bar and see what happens. I get mixed results when I try it.