I've heard that roofer and brickies are in high demand, but it doesn't make waiting any easier!
That's great! The week I was supposed to have bricks start "all" they did was the plumbing and elec roug-in. It was a LOT of work though with the sparkies there tues, wed and a little bit Thurs and the plumbers were there several days too.
That Friday the plasterers came and put all the roof sheets up and then they did a mornings work on the Saturday cutting all the wall sheets and small pieces for above doors and placed them all in the corresponding rooms with the names penciled on.
Don't loose heart, all that could happen before your Bricks even start if your build is the same as mine. During the week of brickwork we got all plaster wall sheets done, then the cornice on Friday and the front, laundry and back garage door on as well.
I have my fingers crossed for you.