Take this with a grain of salt obviously, but I put the image into a plant identification app and it came up with Lepista personata.

Matches the growing in grassy areas and cupping upwards properties from your picture.

Hopefully you’ll get some experts chiming in. I am not. I just found your question interesting and did some searching.

The biggest thing I see to check is whether the gills run vertically *and extend into the stem. If the gills stop at the stem, avoid.

https://grocycle.com/oyster-mushrooms-guide/#:~:text=They%20should%20be%20smooth%20with,white%20to%20brown%20on%20top.

Edit: actually you may not need to avoid if the gills don’t run all the way. If they don’t, there’s a good chance they are Elm Oysters, but elm oysters are edible. I’m basing this info on the above link. It seems pretty clear that what you have aren’t the dangerous varieties listed on that page.

Compare to Pleurotus, growing from buried wood. The ones to rule out here would be the worrisome Clitocybe dealbata group

I'm going NO. Oysters grow on dead trees almost always. They do NOT cup upwards like this. They may be edible (I wouldn't eat them), but they are not tan/white oysters in my opinion (and I've collected and eaten a LOT of white/tan and golden oysters).