I'll also use diff tools built into Vim/Neovim as well to show progress. I personally like the diffing feature and since I normally edit everything in a Vim-like editor it helps me stay focused with the tools I like.
tldr; I use Notational Velocity to capture ideas or copied text, then create an A and B document while I'm editing to determine progress. I repeat the process as needed. But not usually more than two or three times.