RSS Google Base Feed v148 using with OpenCart v149

I currently have OpenCart v149 installed with RSS Google Base Feed v148. Everything works great!

Can someone please help me understand what data is part of the product feed that gets sent from my OpenCart Database to google via the RSS Google Base Feed v148?

I am assuming that the following are part of the product feed...
product->product name
product->product model
product->product descritpion
product->price
any others?

How about?
product->meta tag keywords
product->meta tag description
product->product tags
product->product category

I am basically trying to figure out if I update Product data in my OpenCart database, what data is sent to google via the RSS Google Base Feed v148 module. Of course I would like to send as much info as possible. Any suggestions?

The meta data isn't, and neither is the tags
The category is. Google isn't after you filling their server with as much info as possible, they just want the data you have as it is on your store. I think adding tags and meta info is pointless tbh