If you have auto-optimization enabled, you can also find category performance data on your FAVI report under Statistics > Categories.
You can also easily find statistics for categories in your Google Analytics. In the utm_campaign parameter, we send the product category. In Google Analytics on the Reports > Acquisition > Traffic acquisition > Session campaign, you can find the categories this way. Filter favi here and you will see the revenue brought in by category.
To get data for each product, you need to do the following in your Google Analytics: Reports > Monetization > Ecommerce purchases (here you will see everything you have sold). Next, you will add a secondary dimension of session source/medium in this report. Then you click on the search box and enter favi there. This will show you only products sold through FAVI.