While Hemp is legal, it does get some extra scrutiny because the only way to tell the difference between hemp and marijuana is a lab test. This makes it a good front for selling marijuana.
The goal in monitoring your accounts tied to hemp is to make sure that the activity is "normal and expected" for a hemp business. A wire in for the purchase of product would not be unusual, even from a marijuana legal state. You can certainly request an invoice from the customer to substantiate it was a legal sale, or as Brian suggested, have a conversation with them. And it's likely as part of your EDD, you're getting financials, so does the wire seem in line with those numbers?
If you've done a little research and it seems to be part of their normal operating patterns and within the constraints of hemp, then I wouldn't think you'd need to keep filing SARs. Save them for when they get activity that's not typical for them, and isn't easily explained.