I got the paid version, and still no est. delivery on it.
I don't think USPS gives estimates with international. They dont post them on their site either, just didn't want to be missing something.
On another note.
Just loaded another free IOS app named Fara that works pretty good. As a test I fed it a tracking number that last I checked was in HK but it said it was in SF. I thought I gave it a wrong number but went and checked and it had made it. Parcel was still showing HK but eventually caught up with it.
It appears to allow for more than 3 trackings and no ads. Worth a look.