TLDR : It's now possible to update all your plugins, on all your websites, in just one click. 

You may have seen a new link in WP Umbrella's application. Just here:

You can now update all your plugins on all your websites (in just one click) and this should save you a ton of time! 🕒

The " Update tab " will display all the updates available on your WordPress sites.

The available update are group by plugin. You can click on the plugin to see the number of website(s) concerned by the update. 

Once you have selected the plugin/website you can click on " Update " to trigger the update. 

Quitting the page will not interrupt the update. You will get a notification when the update is completed. Just here: