That I know of, (not to say it's not possible), there's no method for getting the status of an ImportFile operation. Only two suggestions I can put on the table at the moment is running the import operation multiple times, and getting the average time, and setting the status based on the "known" load time. Often, on operations like this, I just pop up a PopUp window that says "Loading..." or the like to notify the user that something is going on.