This means they open your application/they're doing something. Base on my experience.
I applied for my owp last September 22 (3months after I passed my application). Since they can't grant me owp yet til my aip, application is on pause/waiting. Right after I got my aip on dec 24, I sent my aip copy on the webform for them to process my owp asap. I checked on the same day around 5pm, there's a "application/profile Updated" for my work permit. Nothing updated. But today, December 27 they approved my owp finally and its says that on review of eligibility: "December 24, 2019 your eligibility has been reviewed. Please see final decision now".
I also experienced 2 ghost updates for my PR application.