I just tried to batch smush 200+ images and this is the status I got:
The smushing elves are busy, You are 344th in the queue.
Estimated wait time: 14 days 8 hours
This leads to one question: Are you serious?
Please note that before upgrading to SmushPro, used the free version, which smushed the same images within minutes. Only reason I upgraded was to enable 1+ Mb files.