How safe is costco now?

For sure, very safe.

I would stay away from busy times as it's definitely still crowded. costco is doing their part but all the people during busy times still make it a ?

Everyone is wearing masks. Cart handles are wiped off. People try to socially distance. Cashiers don't touch your card and they are behind plastic. People checking receipts at the exit are behind plexiglass too.

Considering the number of increasing cases, it doesn't seem completely safe. Costco is mandating wearing masks, so that's a relief if you have something essential to buy, else would recommend waiting for non-peak times, or waiting for few more days..

It is safe for sure.