hello jahwan.oh,
please try getSensorTimestamp()
for checking the VI HW (SoF/EoF) timestamp based-on tegra wide timestamp system counter (TSC), it’s the timestamp for the sensor (unit in nanoseconds).
you may see-also this topic for reference, Argus::ICaptureMetadata::getSensorTimestamp clock domain in L4T 32.4.4 - #10 by JerryChang