After one of your JoeLister eBay items is fulfilled from FBA and Amazon posts the tracking for that item, JoeLister will automatically upload that tracking information to eBay, which will mark the item as "Shipped" within eBay. The tracking information will be displayed on JoeLister's "eBay Sales" tab.
Amazon usually takes 24 hours (sometimes up to 48 hours) to ship the item and update tracking.
The presence of an 'FBA ID' number shows that Amazon has acknowledged the order and is working on it.
The only time you should be worried is if in the FBA ID column, it says "Not Fulfilled." Then you'd get an email about an issue that may have occurred with the order, and you may need to manually fulfill the order in Amazon then.