I've just sent the copy-edited file of The Tapestry of Time back to my publisher, along with a form giving some information for the audiobook narrators. The book comes out in September. The next step is page proofs (and I should see cover art soon!)
My acquiring/developmental editor and I finished with the big picture stuff in December, and then the manuscript was passed to another editor for the copy edit, which covers grammatical and style issues line by line, clarifications and fact checks, as well as continuity and timeline snarls. This book has an intricate plot that weaves through very well documented history, and it went through revisions that moved around the events of the story. In the end, I'm pleased there were only a few small things that needed to be fixed. I'm always very grateful for the careful work of copy editors!
Authors do get some time (typically two weeks or so) to go over the copy edit to approve or reject changes, or address any queries. While I try not to reject a change out of sheer stubbornness, authors may choose not to take a copy editor's suggestion.
One of the things that my copy editor was checking for was British English, for two reasons: this book is coming out from a UK publisher, and it's written in the points of view of British people. It's very seldom I've been able to write any fiction in Canadian English, with the notable exception of short stories in Canadian magazines. The Venn diagram for how these three forms of English usually interact kind of looks like this (if I oversimplify to show what I mean):