Hotfix #16 included a note about the Mac version being a maximum of 2 weeks away. Today is 2 weeks, so I expect something today or tomorrow. The other part of that note was that they were "currently restructuring to ensure that future updates on Mac will arrive alongside their PC versions." I wonder why it took this long to do that. Like why wasn't it there from the start. I'm also very concerned about what else this "restructuring" may break.
Mac development has been happening in the past couple of weeks.
Have a look at the steam code updates ..
https://steamdb.info/app/1086940/depots/Scroll down to branches section. Mac_Test1/2/3/4 have been updating every day.
When the Public branch gets updated, thats when it goes live.
Seeing as CH Main is currently the most recent update, I think there will be a QA branch soon, if not straight to Public.
So probably sometime this week, unless they find something else that really needs attention .. You cant really hold them to promises, bug fixing this game is complex.