Firstly, congrats on passing the DMI! Have you applied for Mainline or Valleys?
I was told that as well, but I was in the talent pool for around 2 months before I heard about my course starting - I would think you won't have to wait long, but that's just my experience, others may have been waiting a while.
I was delayed as I got holidays wrong, and thought I needed time off this year - when I told Laura I had the wrong year, she put me on the next available course. Have you told them you have pre-booked holidays?
Started my course in May, wasn't waiting long - only delay was my error saying I had a pre-booked holiday, but then I was put on the next available course when I told them my mistake. I started the application in July 2020, so was quite drawn out due to Covid-19 but amazing when I started!