The vast majority of police killings are of people who were armed and chose to get in a fight with them. Even of the few unarmed cases, most of them were asking for it. So if you're just going about minding your own business, the chance is minuscule.
As the NY State report on police-on-police shootings I posted an article about elsewhere in the thread notes, rapidly turning your head to identify the source of a verbal command from a previoisly unseen police officer is the kind of thing that, to police, constitutes non-compliance and choosing to get in a fight with them. Even when you are an off-duty or plainclothes cop who has called for backup, and, much more likely if you are a Black or Latino out-of-uniform cop in that situation.