As of last night, I had read and marked edits for the first nine chapters of the book. I'm not sure what percentage of the book this represents... maybe 40% of the rough draft at a guess. Many of my edits are minor, and I have already updated the manuscript. Some of the edits are more complex comments: "re-write this scene from a different character's POV", or "insert a new scene here", or "we need an entire new chapter inserted here". Those comments will wait until the read-through is done, then I will circle back and start working on them.
Bottom line, progress is being made!