  Kinetic and chemical equilibrations play important roles in the formation of
the quark-gluon plasma (QGP) in relativistic heavy-ion collisions (HICs). These
processes further influence the production of hard and electromagnetic probes
in HICs, in particular, the thermalization of heavy quarks, which are produced
at an extremely early time before the formation of the QGP. We calculate the
drag and diffusion coefficients of heavy quarks in the pre-hydrodynamic quantum
chromodynamic (QCD) plasma with the state-of-the-art QCD effective kinetic
theory (EKT) solver. We present the time, momentum, and angular dependencies of
these coefficients for gluon and quark contributions separately, showing the
effects of isotropization and chemical equilibration from the QCD plasma. We
also provide a simple formula to estimate the heavy quark drag and diffusion
coefficients, as well as its energy loss, within the pre-hydrodynamic plasma at
different coupling strengths based on the attractor theory. We then discuss the
validity of these estimations with leading-order calculations and
leading-logarithmic rescaling factors.
