In order to configure OG Tags for Magento 2 Category Page please go to Admin Panel > Catalog > Categories.
Сhoose a category you are interested in and find an Open Graph Metadata section.
Open Graph Metadata
1. Set an Open Graph title in OG Title field. In case you haven't set it up the Meta Title will be used. If it isn't configured either category name will be used.
2. In the OG Description set the Open Graph description of the category. Meta description of the category will be used in case an OG description hasn't been set up. If there are none of the descriptions configured, the Default Description will be used.
3. Set an Open Graph Image in the OG Image, otherwise, Default OG Image will be used.
After all the changes have been done don't forget to press the Save button.