SOP on the 777 is for the A/T to remain on for the entire flight, including landig. The FBW system means the pitch changes asociated with power change (which is the reason it's better to be "All on or all off" on other Boeings) are taken care of.
That being said, hands on T/Ls during power changes and critical phases is a good technique as it gives tactile feedback of power changes. If the A/Ts DIDN'T go into retard in the flare, whilst you are eyes outside judging the landing, all sorts of mayhem could ensue.