Which option for zypper will list the available patches?

The option for zypper that will list the available patches is zypper lp. This command will display a table of patches that are applicable to your system but not yet installed. It will show the patch name, category, severity, summary, and status for each patch. You can use zypper patch to install all available patches or zypper patch-info to get more details about a specific patch. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-zypper.html#sec-zypper-patches