Not sure when, but March 1, 2018 security patch hit my watch.
Security Patch: March 1, 2018
Wear Version: 2.6.0.176354550 (Unchanged)
Google Play Services: 11.7.46 (530-175121617) (Unchanged)
Build Number: NWD1.180306.004
If anyone has a higher version of Wear or Play Services, shout it out...