In a custom Editor script for StateMachineBehaviour, can you get the timestamp of the default preview panel?

I'm writing an editor script to create an inspector for specialized StateMac$$anonymous$$neBehaviour subclasses, and I'd like to be able to click a button in t$$anonymous$$s custom inspector to get the timestamp of the preview window of the specific AnimationState that's selected. Is t$$anonymous$$s actually possible? It doesn't look like the proper scope exists to access t$$anonymous$$s data from wit$$anonymous$$n an editor for StateMac$$anonymous$$neBehaviour.

Am I mistaken, or is there a way to access t$$anonymous$$s data?