How to read this table
ZHR, the zenithal hourly rate, is the number of meteors one observer would see in an hour under a perfectly dark, clear sky with the radiant straight overhead. It is a standard for comparing showers, not a promise: real counts are almost always lower.
The Moon matters as much as the shower. A bright Moon washes out the fainter meteors, which are the majority, so a strong shower under a full Moon can show fewer meteors than a modest one on a moonless night. We mark peaks as “dark sky” when the Moon is at most about a third lit, “some moonlight” up to 70%, and “bright moon” above that.
Peak times are the moments IMO predicts for the maximum. Some showers have broad maxima lasting a day or more (the Orionids, the Geminids), others are short (the Quadrantids peak for only a few hours), so the peak time is more critical for some than for others.