Beginning with SUSE Linux Enterprise Server 15, chrony is the default implementation of NTP. chrony includes two parts; chronyd is a daemon that can be started at boot time and chronyc is a command line interface program to monitor the performance of chronyd, and to change various operating parameters at runtime.
In the YaST NTP client configuration (Network Services > NTP Configuration) window, you can specify when to start the NTP daemon, the type of configuration source, and add custom time servers as per the source server which was running with ntpd. For more information, see Configuring an NTP client with YaST.