Progress 14 is about boss fights (I think...)
Viewing post in Baldi's Fun New School Ultimate comments
I think. Remember that Johnster Space Games said this about this progress update: "By the time of the next progress update releasing in late September, I should be able to show off something that SWA has been working on for the project, which, not to spoil too much, might help make those bossfight recreations even more accurate."