You’re right, is taking way more time than expected.
Most of the delay it is because the development cycle of this MiG is different than the previous aircrafts, it was meant to speed up the process, making all the desired variants at once. However it was proved not to be fast enough to keep up the usual routine of the weekly report.
But they are almost ready, just a few more days.
timesymmetry 
So, uh….
Why this ones took so long?
You’re right, is taking way more time than expected.
Most of the delay it is because the development cycle of this MiG is different than the previous aircrafts, it was meant to speed up the process, making all the desired variants at once. However it was proved not to be fast enough to keep up the usual routine of the weekly report.
But they are almost ready, just a few more days.