Credits spent per project or chapter

I always forget to note how much credits I spend creating or working on a chapter, and I would love to see a place / button / whatever where the total amount of credits is shown - this would have to update continously while making edits and using plugins or the expand feature.

I would love this because I want to check costs and make acalculation to see if a book is making me money or not after publishing, but I am not sure if this would enhace or reduce credit anxienty for most users.