Don't worry.
If the parcel arrives when you are not home, the carrier will leave a notice telling you where and when it can be picked up.
If it does not arrive within the 30 days after the last estimated delivery date, go to the Resolution Centre at the bottom of this page and open an Item Not Received dispute.
Mention in the dispute that this is a GSP shipment. (Because the seller has done his duty and should not be involved at this point.)
Tracking is a Seller Protection. It is only useful to a Buyer who wants to pay for warm fuzzies.
But basically, as dennis said, it's on its way.
I allow 20 days from payment for deliveries from anywhere in North America, GSP or not. (30 days from Asia).