As of 2017 April, users may externally access Kronos by going directly to https://riverview.kronos.net/. Logon using your UPN username (looks like your email address).
If you still prefer to access Kronos via a Virtual Desktop, you may continue to do so by following these legacy instructions:
Kronos Workforce Central resource has been added to the External Basics VMware View desktop pool. This page pops up full-screen for this desktop pool at login and can be accessed by all users externally via https://desktops.riverview.org/.