service ntpd status
Or u can ajust NTP configuration in YaST
Of course, by default, NTP refuses synchronization if the time difference exceeds 1000s. You can add parameters to adjust this limit, such as the straightforward tinker panic 0
Or, after detecting that NTP has stopped, directly use ntpdate to force synchronization and then start ntp again. If you can accept the risk of time jumps or time repetitions.