Well check this out - today we announced that EMS now has Conditional Access support for MacOS, including Office 2016 and Safari. More details can be found here https://blogs.technet.microsoft.com/enterprisemobility/2017/08/23/azure-ad-and-intune-now-support-macos-in-conditional-access/ for those interested.
More to come on this soon!
** Update **
As you may have seen, we talked about this more at Ignite, including announcing a partnership with JAMF that brings Conditional Access integration..
More HERE and additional details coming as part of sessions at JNUC this week..