It's never too early though I would say being mindful of the effort needed to partner well is very important. You should check out this content I did with the VC Heavybit on what I call "Minimum Viable Partnerships" which provides frameworks on how to think about an initial strategy, setting priorities, and actions that pre-Series A founders should be taking.
https://www.heavybit.com/library/video/test-learn-and-scale-with-minimum-viable-partnerships