Huawei March 2020 security update for Huawei Mate 20 and Mate 20 Pro comes with EMUI 10.0.0.196 and 161MB software size (via Huawei Central).
Huawei Mate 20 and Mate 20 Pro receiving a new EMUI update with March 2020 security enhancements and a second update package fixes issue with system stability in certain situations.
EMUI 11: List of Huawei EMUI 11 eligible devices
The March 2020 security improves system with Google security patches and fixes 2 critical and 20 high levels of Common Vulnerabilities and Exposures (CVE).
According to Huawei Central, the update is rolling out in European markets and may expand gradually.
On the other hand, some users of Huawei Mate 20, 20 Pro, 20X 4G, and 20X 5G are receiving a January security update with EMUI version 10.0.0.188.
Note: EMUI 10 rolling out in batches and the EMUI version and size may vary depending on the region/country.