  Leptonic \textit{CP} violation search, neutrino mass hierarchy determination,
and the precision measurement of oscillation parameters for a unitary test of
the leptonic mixing matrix are among the major targets of the ongoing and
future neutrino oscillation experiments. The work explores the physics reach
for these targets by around 2027, when the third generation of the neutrino
experiments starts operation, with a combined sensitivity of three experiments:
T2K-II, NO$\nu$A extension, and JUNO. It is shown that a joint analysis of
these three experiments can conclusively determine the neutrino mass hierarchy.
Also, at certain values of \emph{true} \dcp, it provides closely around a
$5\sigma$ confidence level (C.L.) to exclude \textit{CP}-conserving values and
more than a $50\%$ fractional region of \emph{true} $\delta_{\text{CP}}$ values
can be explored with a statistic significance of at least a $3\sigma$ C.L.
Besides, the joint analysis can provide unprecedented precision measurements of
the atmospheric neutrino oscillation parameters and a great offer to solve the
$\theta_{23}$ octant degeneracy in the case of nonmaximal mixing.
