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You're not helping yourself in any way. Once the ECU is active (which is before your starter can turn over your engine) your plugs will fire and your fuel pump starts up. The instrument panel is initialized before your key makes it far enough to activate the starter. Your ECU controls your instrument panel so it's displaying what the ECU tells it to. Your ECU doesn't tell it to update the display everytime it takes a reading from the various systems it monitors. If it did your fuel gague would spike everytime you hit a bump or went up or down a hill because of the pressure and surface level differences. Watch your display closely, all those lights don't turn off at exactly the same time which should tell you that it's not the instrument panel that's initializing, it's the ECU taking the time it needs to accurately read adn average out the information it needs to show you what you want to see on the panel. If it takes 3 seconds for all of the lights to go off and/or stabalize, then it takes your ECU 3 seconds to gather the info it needs and process it for you. It takes a few thousand readings per second and "averages" them to display what it does.
Basically, just get in and start it. You're not helping anything by waiting, but you may be hurting some of your systems.
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