Work = This status means we are working to check your offer. If you see this status "Work" and the offer has gone (disappeared) it means that you are all set to get paid for that offer, but we must perform last security checks before processing the payout. If you see "Work" and the offer is still appearing in the section where you took it from it means we haven't processed all the checks on that offer yet.
For more information on other status' visit My Offers and scroll down to the information shown.