Receiving a package from the US

Good day! I am receiving a parcel from the US in 3 weeks via USPS First Class Mail. I live in Beijing (CBD) and I understand packages go through customs scrutiny. Will I be receiving a call or some written notice will be sent to me informing me that my package needs to be picked up (and the taxes paid for)? Or is it done at the doorstep? I also saw a local China Post office near the subway exit near my house. Will my package land there or in some central hub (as I read in a very old blog post)? Thank you for your help.