I live on the West coast of FL & we have Cubensis & Copelandia in massive quantities. You're best bet is to find someone who is familiar with the species in your area & learn from them. Cubensis are pretty easy to ID. Blue bruising of the stem is the best indicator. Once you get the hang of it, it's easy & fun. I don't even like tripping on shrooms but I love to go out picking for fun.
They mostly grow in shaded or wooded areas near trees & fences rather than out in the middle of the field. You don't have to go in the morning. They come up at any time. The sun might dry them out a bit though. Watch for ranchers. Some are cool with people picking, and some might shoot at you with rock salt. If you feel comfortable, you can ask the rancher for permission to "gather manure for an organic gardening project." That way, even if they do see you picking mushrooms, they probably won't call the cops or pull out a shotgun.
Edit: Just want to add, driving into my neighborhood which is mostly cow pasture you can literally smell the mushrooms at night. When they're blooming they're everywhere. Watch out for snakes. Also, sloshing around in wet cow pasture is a great way to get hookworms. Don't wear sandals or flip flops. (experience)
