There has been a notable shift in the projected track of Hurricane Irma, with a leaning toward a path very close to the Atlantic side of the peninsula, but it's still too early to put a lot of trust in specific impacts at any given location. The biggest thing remember right now is that the average error for the path of center of the storm is greater than the width of South Florida, and nearly twice the width of North-Central Florida.
Preparations for the hurricane should be completed before the arrival of the tropical storm force winds.
The outer bands could move in as early as Saturday morning in South Florida, moving up to the I-4 corridor by Saturday evening, then on to portions of North Florida by early Sunday.