The 1.2 MHz GBP means the open-loop gain drops to unity at 1.2 MHz; at 10 kHz you have roughly 120× gain available before the bandwidth rolls off.
Supply range and temperature — staying inside the commercial envelope
The LM324KPWR operates over a 3 V to 30 V supply span, which covers common single-rail 5 V and 12 V systems as well as split ±15 V supplies. If your board sees ambient below freezing or above 70°C, this is not the variant for that environment. Each of the four channels can source or sink up to 30 mA, and the total quiescent current for all four amplifiers is 1.4 mA typical.
The package is a 14-TSSOP (4.40 mm width) on Tape & Reel or Cut Tape. The surface-mount footprint uses 0.65 mm pitch — finer than the legacy SOIC-14, so verify your PCB land pattern and reflow profile before committing the board.