Or rather the way to a finished supplement in this case is indeed a long one, so we made a little map for that journey. From now on you can access the current state of the project on the Roadmap tab above, which allows you to keep track with our progress.
The lack of deadlines is indeed intentionally as our available time and motivation dedicated to the project isn't really predictable on a longer term and so a milestone-based roadmap will serve everyone way better - less pressure for us and no disappointment from passed deadlines for you.
So long, enjoy the current content and look forward to future updates.