Focus is not a strong suit for phone cameras . . .
Illustrated here is how the cam gears should line up when correctly timed with TDC marks on the main drive gear of the crankshaft.
Both cam gears are the same (cheaper production?) with offset holes and text and marks in specific locations.
When the cam gears are attached correctly, initial timing is set with the outward facing arrow on each pointing inside roughly toward each other.
The text of the corresponding cam is visible - 'EX' for Exhaust on the left here (right side of engine) and 'IN' on the other one (not visible here).
And when the cam gears are attached properly, the hole not used is where the pegs for the timing jig hold the cams with relative precision relative to the plane of the top of the head.
When timing, the valve cover gasket is not present, and the top of the head is used for the datum for aligning the now-horizontal mark with the arrow pointing down to it, and faintly visible on the intake cam gear is the same mark and down arrow.
@hoopla this is the mechanism by which, if the directions are followed, it is fairly straightforward to have the correct cam on the correct side, and timed correctly.