update from 16 June: Engineers discovered technical problems with the CZ-3B rocket during pre-launch checks. As a result, the launch of the last BDS-3 constellation satellite has been postponed, and a new launch date is to be set.  

Pre-Launch Countdown Starts for the Last BDS-3 Satellite
14 June 2020
The final satellite to complete the third-generation network of China's Beidou Navigation Satellite System is now ready for launch, according to the China Satellite Navigation Office. The spacecraft, the 59th in the Beidou family and 30th in the 3rd-generation series, has undergone technical checks, propellant injection and pre-launch setting at the Xichang Satellite Launch Centre in Southwest China's Sichuan province, the office said in a statement on 14 June, adding that the Long March 3B carrier rocket to lift it to a geostationary orbit will soon be fueled up at the centre. The launch window is set for the 16 June between 10:11 h and 10:50 h (Beijing Time). In the meanwhile, almost 100 front-line workers who helped fight the Coronavirus pandemic in Hubei or assisted overseas or in their hometown arrived at the Xichang Satellite Launch Centre. They were invited by the China National Space Administration, The China Satellite Navigation Office and the China Aerospace Foundation to attend the launch of the last Beidou 3 satellite.