Early afternoons: Hunt w/in 200 yds of picked beans or corn (edges less desirable). If it's sunny & warm, hunt thinner cover & around edges of sloughs/ponds w/ standing water. If it's real windy or cold, find trees close to picked crops.
Now that sunset is roughly 5:00, from 2:00-4:00 is going to be tough unless you can hunt standing crops or find a relatively small area of cover/trees surrounded by picked crops that's the only cover in town, like a buffer strip (hard to come by in SD).
Last hour, hunt thick stuff near crops, picked or standing. Has to have nice fuzzy stuff down low for roosting.
No real need to pound big cattail sloughs yet, plus lots will be too wet to hunt.
Hunt into the wind to cover your sound. If real windy (20 mph +), you can get away hunting w/ the wind. Either way.....be vewy, vewy qwiet.
These generalities should do well much of the time w/ the weather we've been having, but just about the time you think you have them figured out, they go & prove you wrong.