Apparently, this link says the Chinese purchased 170 D30KP2s in 2016 to power 40 Y-20 production models. I think it is still possible that most Y-20s produced so far (except for the few that have been equipped with the WS-20) are using these imported engines, considering the best estimate for the current Y-20 count is approximately 40. Since no purchases have been made since 2016, this is a very good indicator that the mass production of the WS-20 is imminent, if not already underway ... the WS-18 is being used to power the new H-6 models.
Link claims 463 D30 engines imported from Russia for H-6K & Y-20
https://www.china-arms.com/2020/01/d30-engines-for-y20-and-h6k/
2009 - 55 D30 for 20 H-6K (weasel's note: ties with Sipri reporting which indicated this may also be for Il-76)
https://www.uecrus.com/eng/presscenter/odk_news/2011/?ELEMENT_ID=1291
2011 - 184 D30 for 5 Y-20, 80 H-6K ((weasel's note: Sipri also indicated for Il-76, tiananmenwordpress indicated 41 used for IL-76)
2016 - 170 D30 for 40 Y-20 (Not reported by Sipri)
2016 - 54 D30 for 20 H-6K (Not reported by Sipri)
Total 463 D30 imported