If you read back a few pages of this thread then you may find a few answers, set three is supposedly imminent, with 4 to 7 following not too long after, and sets 8-9 delivered to Wabtec. Wabtec have also announced that production will also be taking place at Kilmarnock as well as Doncaster with all sets by the end of 2019.
So yes I've gone back a few pages, which i should have done, thanks, and caught up a bit.
Great news that Kilmarnock are now getting some of the Mk3 work but this will take time to train people and setup and should have been done right at the start, when you think of the amount of conversions Doncaster were/are trying to do for Scotrail, GWR & XC.
I'm still sceptical though on timescale, and just because Rail magazine were told by Scotrail that Wabtec had said that 24 sets would be delivered by the end of 2019 does not mean they will be. I hope they are though as we all know it affects other TOCs as well.
At the moment it must be about 4-5 months per set, so that's about one vehicle per month. I might be over exaggerating a bit though.
So set 3 is imminent and then sets 4-7 not long after!!! We shall see.