For a detailed overview of all the scripts and their update-status and wether there is a new version available, the columns provided by ScriptWizard are meant to be used: See an example here: Columns: ScriptDetails (update status of add-ins etc)
This allows you to sort the list of add-ins, select those which you like to update and then let SW do it's job by choosing "Update" from the button for each or all of them.
Parsing a date from the regarding upload and version and have it visible in the overview probably is also a nice thing to have, will add that to the "todo-feature" list.