  We report here on the timing of 597 pulsars over the last four years with the
MeerKAT telescope. We provide Times-of-Arrival, pulsar ephemeris files and
per-epoch measurements of the flux density, dispersion measure (DM) and
rotation measure (RM) for each pulsar. In addition we use a Gaussian process to
model the timing residuals to measure the spin frequency derivative at each
epoch. We also report the detection of 11 glitches in 9 individual pulsars. We
find significant DM and RM variations in 87 and 76 pulsars respectively. We
find that the DM variations scale approximately linearly with DM, which is
broadly in agreement with models of the ionised interstellar medium. The
observed RM variations seem largely independent of DM, which may suggest that
the RM variations are dominated by variations in the interstellar magnetic
field on the line of sight, rather than varying electron density. We also find
that normal pulsars have around 5 times greater amplitude of DM variability
compared to millisecond pulsars, and surmise that this is due to the known
difference in their velocity distributions.
