The not-so-hot news is that it took me an extra week and that "10K" gap was more like 20K.
But yeah, the big lump (the final space battle in the book) is (in my not-very-humble estimation) pretty darn good.
All the pieces are in, and in the right order, and the size should be stable...the polishing and corrections left to be done shouldn't shift the word count more than a few thousand words.
In the last stage, it's like watching one of those reverse-videos, where something that's exploded or been smashed pulls back together and then it sitting there whole. Things start coming together from all over the series, not just the one book, and it crystallizes as what it is. There are usually bits of grit and stuff stuck to it that I have to polish off, but it's a great feeling when it's done and I realize it is a book after all (because there are parts in the late middle when I doubt that this will happen and think it's nothing but a big muddle of many thousands of words.)