Huawei recently delisted the Mate 10 Pro from its security update schedule page. The old flagship is set for one last hurrah, however, in the form of the EMUI 10 update, and the OTA has now been officially confirmed to start rolling out globally in March.
https://www.notebookcheck.net/The-global-EMUI-10-update-rollout-for-the-Huawei-Mate-10-Pro-is-at-hand.454625.0.html