The two best safeties in the 2020 draft lasted until the 2nd round. Unfortunately, we don't really know what that means since both were injured and put on IR. Grant Delpit ruptured his Achilles and missed the season, while Xavier McKinney fractured his foot and play only a little at the end of the season. He did intercept a pass against the Cowboys to seal the win for the Giants. So we don't know how good these two guys are at the NFL level.
I think there are a few safeties in this draft who could be as good as Delpit and McKinney and they will be available at the top of the 2nd round. But I still think this is a weak draft class overall so we could see the top safeties picked earlier because they present more value than some of the other players.
I see we have some skeptic on this forum who don't think the Cowboys will draft a Safety as high as the 2nd round. Count me in that group. I think they will wait until the 4th round to take a safety, but I am a cynic.