  We explore the dynamics of a resonant Bose gas following its quench to a
strongly interacting regime near a Feshbach resonance. For such deep quenches,
we utilize a self-consistent dynamic field approximation and find that after an
initial regime of many-body Rabi-like oscillations between the condensate and
finite-momentum quasiparticle pairs, at long times, the gas reaches a
pre-thermalized nonequilibrium steady state. We explore the resulting state
through its broad stationary momentum distribution function, that exhibits a
power-law high momentum tail. We study the dynamics and steady-state form of
the associated enhanced depletion, quench-rate dependent excitation energy,
Tan's contact, structure function and radio frequency spectroscopy. We find
these predictions to be in a qualitative agreement with recent experiments.
