Total Pre-Generated Invoices Number on Warehouse Page (Open Pickwaves)

On the Complete Ready to Pick page, you can see the total units picked and the total orders dispatched, but it would be really helpful to be able to toggle the amount of invoices with pre-generated labels too. We find it much easier and quicker to pre-gen the labels (especially for Amazon and Amazon Easy Ship), so having a quick visual check of which pickwaves have already been pre-generated would be useful (instead of either checking on platform, or navigating to the Orders page to see the pre-gen flag next to the order)