wpkg --update-status

Options Comments
--admindir Define the administration directory, where the database of the installed packages resides.
--debug Define a set of flags of things to print out for debug purposes.
--instdir Define the installation directory, where the data files are installed on the target.
--quiet Request for warning messages to not be displayed.
--root Define the installation root path.
--verbose Display log information of level INFO.

The --update-status command prints out the status about the last --update run. This information comes from the updates.index file found in your target database under the core package. That file is text so you can read it, the --update-status makes it a lot more humain friendly, though.

The --verbose flag can be used to get additional details about the last run.