Chrome 70 is live as of 10-16-2018. Distrust errors may not be displayed immediately as distrust is done in stages and independent of Chrome reelease dates. Please reference the following for more information,
Browsers and root program owners have plans to remove trust of all legacy Symantec SSL/TLS certificates issued under the Symantec infrastructure. Websites and applications secured with these legacy Symantec SSL/TLS certificates trigger security warnings in browsers and application relying on its root store:
More details from Google, Mozilla, Apple, and Microsoft:
Google security blog
Mozilla security blog
Apple information about distrusting Symantec certificate authorities
Microsoft partners with DigiCert to begin deprecating Symantec TLS certificates
DigiCert blog regarding Appple distrust
Symantec TLS/SSL certificates affected by distrust are based on their issuance date. Refer to this table and check your certificate inventory for certificates at risk of potential distrust.
Final distrust of the Symantec SSL/TLS certificates in Chrome 70 stable will occur independent of Chrome release date.
Also distrusted - Certificates issued from the legacy Symantec root hierarchy on or after December 1, 2017
For uninterrupted business continuity, some Managed PKI for SSL customers continue to issue certificates from the legacy Symantec root hierarchy after the December 1, 2017 switch to the DigiCert hierarchy. These certificates are already distrusted by Google Chrome and will be distrusted by Apple on August 1, 2018.
To identify impacted certificates: