Target as limit (revision mode for progress bar?)

When I’m revising, I’m usually trying to cut down an overly-long document to fit a word count limit. It would be nifty if I could put the document into revision mode and have the progress bar colors reverse themselves: red if I’m over the target, and green once I’m under.

An option to limit the word count with red to show when over is coming!
All the best,
Keith