How to read NTP status

Hi All,

I have a question to read the ntp status. Lets said the following example:

server1# ntpq -p
  remote           refid      st t when poll reach   delay   offset    disp
==============================================================================
*timeserver1  3 u  507 1024  377     0.40   24.351   28.32
+timeserver2 3 u  630 1024  377     0.84    4.210    9.26
clusternode1-pr 0.0.0.0         16 u    - 1024    0     0.00    0.000 16000.0
+clusternode2-pr 4 u  550 1024  377     0.69  -10.914    4.20

And the ntp.drift file is 65.345 . (something like this)

I know there are bunch of reading on google or docs.oracle.com, but there isnt one who tell me what exactly I need to look for.

I want to know how to determine the ntp is wrong and my time is sync correctly. What value I suppose to look on??