As I left the site the framers were just starting to lay down the forms to outline the foundation. That should take just a few days, depending on weather, and then they'll be ready to lay down the plumbing and the in-floor electrical receptacles. They should also be forming the foundation for the garage. I expect all that will get done by early September so the foundation can be poured. And that's a lot of concrete. The foundation for the house alone is expected to be almost 3200 square feet and the garage will be almost 900 square feet.
Assuming that has to harden for a few weeks, framing the house should start in late September or early October. By then we should have a better idea of just how big this project has become.