How soon is too soon to ask about a potential partner's polyam dynamics?

I’m in the early stages of seeing someone who is poly and has other partners. I’ve never been in a Proper Relationship before nor been involved in a polycule but I do think it’d be the best form of relationship structure for me. I’m just a little unsure of how soon is too soon to ask about how their specific polycule works/their boundaries/etc?

I’m generally of the opinion that as long as you’re engaged in any sort of flirting, “early stages of seeing,” or any relationship with someone that isn’t, like, They’re A Stranger On Public Transit or Your Boss or something, there’s no such thing as “too soon” to ask about someone’s polyamorous philosophy, boundaries, and structure. Any person practicing healthy polyamory would be thrilled that you brought it up. Go ahead and ask those questions!