Beck Waters has those times above. Benford is the fastest DB the bills have right now and he ran a 4.53, so I guess Myles Bryant slower when Jones isn't active.
Bills will occasionally play some Cover 3 and man, but I'm not sure we'll see much of that at all against the Dolphins. I think the variation will come with Quarter vs 2 and some cover 6 as well, backers playing man, zone or blizing. But I'd be really surprised if we don't have 2 deep safeties on practically every play