Under USERS > DEVICES within ForeFlight on the web, the word "Current" in the Data column means that none of the downloaded data on that device has expired. This gives no indication, however, as to whether or not an upcoming set of data has been downloaded.
The word "Expired" in the Data column means that some of the downloaded data on that device has expired.
An item will change from "Current" to "Expired" when a current set of downloaded data expires and the new set has not yet been downloaded. Downloading the new set will then change the status back to "Current".
Image 1. Data Column shows devices as "Current" or "Expired."