I am in the same boat, so to speak.
I had ordered an EAF bracket for the SCT FTF. ZWO shipped on the 26th of May. Tracking shows that it has been stuck in Shanghai since the 28th of May.
I am not in a hurry and chose free airmail (ChinaPost). You may have done that too -- if you need faster delivery times, you probably should have used EMS or UPS.
This kind of delay is expected with ChinaPost. For example, I had ordered a head thermometer in late April directly from a vendor in Shenzhen (nothing was available in the USA back then). It finally appeared 4+ weeks later through US Postal Service mail (not a fault of USPS; it too was stuck in some Chinese airport). By that time, Amazon had them in stock.
My recommendation is to give it 6 weeks before panicking.
Chen