OV9281 Trigger Issue

I bought 4x of this camera this camera and I’m having an issue with triggers and associated images.
https://www.uctronics.com/arducam-ov9281-mipi-camera-module-1mp-global-shutter-mono-camera-130-jetson-nano.html

Because the camera turns on with trigger_mode off by default, images will start to come with or without a trigger. When I command to turn the trigger mode on, I have no way of knowing if the next image I received is the one that was triggered, or one that was buffered in the driver.

My question is, can you turn the camera on with trigger_mode ON by default, and if not, is there some way I can query to know what image is the first image to be taken from a trigger?

The complete example is here:
https://github.com/ArduCAM/MIPI_Camera/blob/master/Jetson/Jetvariety/external_trigger/arducam_external_trigger_demo2.py

I am also looking into this issue. How can we get the image from the exact time of triggering and not a buffered image from some point in the past?