@4balls_guy
Hard to say. Usually its 1 chapter every 1-2 months or so. But last time (mid-December) we got a double release - so it might be another 2 months.
The thing is this manga has LOOOOONG and also "complex" chapters with lots of text and references + historical anecdotes etc. Translating it is not as easy as some other series. Also as far as Im aware its a rather small team doing the work in the first place.
The RAW version is releases a chapter once a month so thats 12 chapters a year. Currently the original version is 10+ chapters ahead of the English version - I believe chapter 63 dropped only a few days ago.
As for the OFFICIAL release its currently at volume 12 (chapter 31-33) with volume 13 being released on the 23. Feb.
As the official version releases regularly once a month with 3 chapters or so, it will soon catch up to the fan version. Having said that... the fan version IMO is "better" translated... lol