Aidey: If they're still running more than a week late, then the change to "build in progress" seems to happen on the Saturday night before the next BW commences. If yours changes next Saturday night/Sunday morning then chances are it is getting built a little behind schedule. My BW33 GTD was built Sunday/Monday of BW35 with the tracker changing to "build commenced" on the cusp of BW33 (Sat night) to BW34(Sun morning).