@ya-831275,
Items purchased through the GSP are sent by the seller to the Pitney Bowes warehouse in Erlanger, Kentucky.
The screenshot you've attached shows that your item has been picked up the domestic carrier USPS in New Jersey, and has been transported by USPS to their Ohio distribution centre. It's left that distribution centre, so it's still on its way to KY. From Cincinatti to Erlanger isn't far.
The initial tracking that you received is the domestic tracking, and I suspect that the next tracking event will be when the parcel is delivered to the PB warehouse.
From there, things will stagnate for a while. PB will do whatever is involved in preparing the parcel for international despatch, and you could well be a week or more in the dark. Eventually, however, the parcel will be ready, and a new tracking number (international despatch) will be issued.
Even once the parcel arrives in Australia, be prepared to wait; the GSP isn't a priority service, even though its cost may mislead buyers into thinking it jolly well ought to be!
In general, though, most purchases through the GSP will go smoothly. If the estimated delivery date comes and goes without your receiving the parcel, of course you will want to follow it up and check the tracking in case something has gone amiss. But you shouldn't start to worry (or even to consider making a claim on the basis of non-arrival) until the latest estimated delivery date has been passed.
