Boeing 737-Max may not be able to fly to china for at least 1 year.

https://www.channelnewsasia.com/news/asia/china-not-taking-boeing-737-max-8-airworthiness-certificate-11382038

China won't give certification to Boeing 737-Max now and it may take up to 15 months to get the certification in China.

Therefore, no Boeing 737-Max will be able to fly in and out of China since it doesn't have the airworthiness certification.