So this capital gains classification for catalog sales is a major boon. But note that it only applies to sales. Royalty income, advances, etc. all count as regular income.
I typically send a follow up email about a week after the initial proposition and then I’ll call their office to follow up a week after that. This is why it’s good to get the ball rolling as soon as possible. Organizing events even months in advance is easier than cramming a ton of planning into just a few weeks.