I'm not sure if you are trying to find out how to land a 747 decently, or just mucking around with to sim, but...
1st. Because of the height of the cockpit during the flare, there is a tendency not to. At least, not in time that is. Soooo, in addition to all the wonderful eqpt. the 747 has installed, is the GPWS, whose several modes include one that calls out, amongst other things, your radio altitude, in specific incriments. THE must important one is the '50' foot call, followed by 40, 30, 20, 10. The technique we are taught is to begin your flare maneuver right after 50'. The rate of the following callouts probably are more important than the actual callouts, as they tell of how fast you may still be sinking. If in the end, you make a good landing,you get compliments all around. You should really remember those, because one day, things will not go very well..... and you will mutter some foul words, followed by this terrible silence in the flight deck during the taxi in. Then, you know your FPM, whatever they were, were in excess.
Have fun.