swlist -l product GOLD\*
will list the individual patches in the GOLD bundles. They are rereleased every few months. So the list of patches is not fixed.
But there could be other bundles or even individual patches installed as well. So you really need to do:
swlist -l product | more
and go through the whole list.
Here are some links that may help you:
Support Plus: Quality Pack Bundles
Support Plus: Information Library
The second page has a link to the README file for each recent bundle. That file lists all the patches in the bundle.