How do I enable ntpd to serve ntp clients (using macOS 10.14 Mojave)? So on macOS High Sierra 10.13, this answer worked fine: How to enable ntpd to server ntp clients (using High Sierra)

Now I am running macOS 10.14 and they have removed both ntpdate and ntpd-wrapper (which was what the org.ntp.ntpd-legacy.plist LaunchDaemon was using).  

Is there a solution to configure a similar ntp relay with macOS 10.14?  

I am using a Mac Pro (Late 2013) which has 2 ethernet NIC's, and have one NIC with internet access, which is syncing to time.apple.com.  I need the second NIC that does not have internet access to act as an ntpd server for the devices on the private network segment that does not route outside it's private LAN segment.
From Macrumors (in the Mojave 'All the little things' thread):

Time sync: ntpd has been replaced by timed: not the old school unix one, but a new apple invention.

Have linked the timed Man page for ya:

https://www.unix.com/man-page/mojave/8/timed/