Your investment immigration application (also known as the Eb5 visa) would be accepted in a perfect world. Then you could focus on your immediate family's move to the United States. This is not often the case and timing doesn't always work out exactly.
Hiring a reliable agency to get investment immigration visa is a nice approach. They know all the business trands and hence will help you out. You can get useful infromation for Australian business investment immigration visa from Mygration.
Many immigration lawyers who are familiar with the eb5 visa process know how long it will take. If you're lucky enough to be working with an experienced lawyer, they should advise you to apply as soon as possible.
The sooner you apply, you'll be able to move and settle in your new home. A rule of thumb is to wait about a year before you move. Although many applications are accepted and denied in three months, there is always room for error.
While many immigrants want to move as soon and as easily as possible, there are some preferences that must be taken into consideration when applying. It is best to move when the weather is hot if you're moving from or to a hot region.