The command line tool for patch and package management on OpenSUSE is "zypper". I've used zypper to list patch updates using:
# zypper lu
The patches can be added (updated) using:
# zypper up
Because I never got around to reading the man page, I didn't realise that both the above commands have an implicit "-t patch". I also didn't realise that "-t package" applied to the above commands can be used to display and update packages to a later version.
# zypper lu -t package
# zypper up -t package
Currently installing 83 package updates...