Afaik this is not yet operational: https://www.scmp.com/news/china/science/article/3317905/buckle-china-unveils-maglev-marvel-redefining-future-high-speed-rail

“Representatives said the first phase of engineering was completed in July last year. More route and safety tests and engineering viability assessments will be carried out before the train can go into commercial service.”

But it does appear that they have successfully finished the proof of concept tests: https://www.newsweek.com/china-maglev-high-speed-rail-2097232

“The most recent test, demonstrated at Donghu Laboratory in Hubei Province, saw a 1.1-ton Maglev train accelerating to 404 mph in just under 7 seconds over 1,968 feet. The test follows a trial of the same technology last year, which achieved speeds of over 620 mph”