Typically when updates are made to the CloudExtend Gmail for NetSuite extension they are rolled out to users by Google. Depending on the number of users this could take up to 24 hours.
If you're not willing to wait for the update then follow the steps below to get it right away.
View your extensions (enter chrome://extensions in your browser) and enable Developer mode.
Locate the CloudExtend extension, click on 'Details', and then click the Update button