and should be at idle no later than main gear touchdown
The problem with some is that they believe that once the thrust levers hit the idle stop that the power is immediately at idle. To get idle thrust at touchdown the trust levers need to hit the idle stops before the main wheels hit the pavement.
This is also observed when coming out of reverse. I see many going through to the full down position while the engines are still winding down, giving a burst of forward thrust when you really don't need it.
The thrust lever position indicates commanded thrust & the N1 gauges indicate actual thrust.