UE4 Timers and Blueprint - Same Thread?

The question is simple, do both of these run in the same thread?
I am asking because I need to know whether or not I need to make my plugin thread-safe.

Functions can be called from Blueprint, and the plugin is running on a 50ms Timer that is initialized from Blueprint.

They’ll both run in the game thread I believe. Timers are just actor components which respond to tick events, much like a regular blueprint.