It tecnically already has been updated. However, things work kinda different around here, in contrast to most plugins.
You are supposed to pay a monthly subscription if you want the latest dev builds (Which should currently include doubtful quality 1.12 builds). You can just pay once though (You'll provably have to pay again in the future if you want to keep it up).
I don't like this system, and I've already expressed this many times, but I guess it's Xikage's right to do so, and nobody else seems to care.
By the way, last time it took around 4 months between mc's 1.11 release and MM's actual release. Which is provably what you would like to know.