I had thought I was at the stage of final editing --just removing a few typos, etc.-- but I now can read the book as a whole (from start to finish) and I find that the first few chapters are not as well written as the final few --and so more revisions will ensue.
I do think that all of the changes now will be stylistic, rather than substantive, but as the month of July comes to an end, the book is not (yet) finished.