Hello @nvagriculture,
Thanks for writing in! Yes the latest version is compatible with WP 5.0.2. Please be advised that we have released X 6.4.6 and Cornerstone 3.4.6. It is now available in automatic updates. You can now update to this latest version. This latest release contains fixes for several issues so be sure to check out the changelog (http://theme.co/changelog/).
After doing the updates, always remember to clear all caches (if you are using WP Rocket, WP SuperCache or W3 Total Cache) when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
And if you are unsure of these updates, I would highly recommend that you create a staging site. This is very useful because you can test drive any X updates in the staging area, do the customizations and troubleshooting without disrupting your live site. Once everything is perfect, you can easily and flawlessly proceed the update in the live site. To know how to create a staging area, please check out these articles:
Hope this helps.