I am in the same boat.
CEC (Chinese live in USA right now, no additioanl documents asked)
AOR: 2017 Dec 11
Medical pass and IP2(we are processing your background check): 2017 Dec 21
NA3: 2018 Jan 02
Application status: We are processing your application. We will send you a message when there is an update or if we need more information from you.
Review of eligibility: We are reviewing whether you meet the eligibility requirements.
Review of medical results: You passed the medical exam.
Review of additional documents: The additional documents you provided are being reviewed.
Interview: You do not need an interview. We will send you a message if this changes.
Biometrics: We do not need your fingerprints. We will send you a message if this changes.
Background check: Not applicable.
Final decision: Your application is in progress. We will send you a message once the final decision has been made.