While some companies have resumed work their postal system hasnt.

https://www.fasttech.com/forums/off-topic/t/3053416/don-t-expect-any-deliveries-till-march-from-china?3053416

The information has already been posted.

Shenzen has had very few infections compared to other cities, if the data is to be believed.

Interactive map:

https://gisanddata.maps.arcgis.com/apps/opsdashboard/index.html#/bda7594740fd40299423467b48e9ecf6

Hope this information helps to answer your question.