Get actor transform at time in python

I have been a python programmer for many years but I’m fairly new to Unreal. I understand levels, sequences, actors, etc. I’m developing a python script to export 3D data out of UE to import into After Effects using a custom script I made (I’ve been doing this for years in 3DS Max, but now we’re switching to Unreal). I can get at an actor’s transforms using actor.get_actor_transform() but how do I do this at a specific frame, in a specific level sequence? My mind is still bending trying to understand how UE doesn’t totally have a concept of a “timeline” except within the context of a sequencer, which the API documentation hardly covers…