Progress and Place in Queue Not Changing

Hi - I installed WP Smush Pro and ran the request for it to optimize all of the images on this site. That was yesterday afternoon (about 18 hour ago). At the time I set it up the notification said that 154 images were sent and that I was 6th in line. The estimated time was 1 hour.

The message still says the same thing, 6th in line, estimated time 1 hour.

What do I need to do in order to get this plugin to work.