  The Early Release Observations (EROs) of JWST beautifully demonstrate the
promise of JWST in characterizing the universe at cosmic dawn. We analyze the
ERO spectra of three $z \sim 8$ galaxies to determine their metallicities, gas
temperatures and ionization. These galaxies offer the first opportunity to
understand the physical properties of epoch-of-reionization galaxies through
detailed rest-optical emission line spectroscopy. We show that these objects
have metal abundances $12+\log[O/H] \approx 6.9 - 8.2$, based on both the $T_e$
method and on a recent calibration of the $R_{23}$ metallicity indicator. Since
the spectra are some of the earliest science data from JWST, we compare several
line ratios with values expected from robust physics, to validate our
measurement procedures. We compare the abundances and emission line ratios to a
nearby sample of Green Pea galaxies -- a population of nearby emission line
galaxies whose UV properties resemble epoch-of-reionization galaxies, and which
often have large Lyman continuum escape fractions. The JWST data show striking
further similarities between these high redshift galaxies and nearby Green
Peas. The $z\sim 8$ galaxies span the metallicity range covered by Green Peas.
They also show the compact morphology that is typical of emission line
dominated galaxies at all redshifts. Based on these similarities with Green
Peas, it is likely that these are the first rest-optical spectra of galaxies
that are actively driving cosmological reionization
