#command #ntpq -p

Table headings:

remote – The remote peer or server being synced to. “LOCAL” is this local host (included in case there are no remote peers or servers available);
refid – Where or what the remote peer or server is itself synchronised to;
st – The remote peer or server Stratum
t – Type (u: unicast or manycast client, b: broadcast or multicast client, l: local reference clock, s: symmetric peer, A: manycast server, B: broadcast server, M: multicast server, see “Automatic Server Discovery“);
when – When last polled (seconds ago, “h” hours ago, or “d” days ago);
poll – Polling frequency: rfc5905 suggests this ranges in NTPv4 from 4 (16s) to 17 (36h) (log2 seconds), however observation suggests the actual displayed value is seconds for a much smaller range of 64 (26) to 1024 (210) seconds;
reach – An 8-bit left-shift shift register value recording polls (bit set = successful, bit reset = fail) displayed in octal;
delay – Round trip communication delay to the remote peer or server (milliseconds);
offset – Mean offset (phase) in the times reported between this local host and the remote peer or server (RMS, milliseconds);
jitter – Mean deviation (jitter) in the time reported for that remote peer or server (RMS of difference of multiple time samples, milliseconds);