I don't think they have a lot of control over it, and they always told me that changing anything in the order could delay it even more.
They were helpful in the sense that I was getting info that wasn't available to me just checking my account.
They sometimes can tell you what are the odds that your delivery will be pushed back even more, based on order date, configuration etc. But it's not always accurate, there's some guessing involved.
The point where I was getting more useful info was when I got my 4 day window. But then a VIN was already assigned to me, even though I couldn't see it yet. So they were able to track the car, if it was still in the factory or not, real estimates etc.
In any case, I highly recommend you to pay a visit to St Bruno store from time to time and speak with someone in person. SMS and email communication is just not good and we're left in the dark many many times.