When wordpress has an update waiting to be installed it’ll let you know about it all over the admin dashboard.
Click on any of the notifications to go to the plugin updater.
Click on the checkbox next to the plugin you want to update or the select all checkbox to select all the plugins.
Click Update Plugins.
It may take a while to update the plugins especially if you’re updating a lot of plugins at once. When you see the All updates have been completed message you’re all done!