I'm sure this will be data extracted eventually, but here's some starter numbers until we get that... No, I'm not measuring landing lag or attack cooldown or the start-up of "rekka" moves (like ftilt 2 or jab 2); someone else can do that.
Jab - 2
Ftilt - 7
Utilt - 8 (won't hit grounded Mario aside you until f10, seems to hit a BF platform above you on f9)
Dtilt - 9
Fsmash - 16
Fsmash Charge Release - 11
Usmash - 12
Usmash Charge Release - 6
Dsmash - 12 (front) / 16 (rear)
Dsmash Charge Release - 7 (front) / 11 (rear)
Dash Attack - 7
Standing Grab - 6
Running Grab - 9
Pivot Grab - 9
Nair - 8
Fair - 10
Bair - 14
Uair - 7
Dair - 9
Nspecial (Ptooie) - 9 (as an anti-air, direct above the plant)
Sspecial (Poison Breath) - 23 (released, first tick of damage, some windboxes before this point)
Uspecial (Piranhacopter) - 13
Dspecial (Long Stem Strike) - 20 (no charge)
Jab - 2
Ftilt - 7
Utilt - 8 (won't hit grounded Mario aside you until f10, seems to hit a BF platform above you on f9)
Dtilt - 9
Fsmash - 16
Fsmash Charge Release - 11
Usmash - 12
Usmash Charge Release - 6
Dsmash - 12 (front) / 16 (rear)
Dsmash Charge Release - 7 (front) / 11 (rear)
Dash Attack - 7
Standing Grab - 6
Running Grab - 9
Pivot Grab - 9
Nair - 8
Fair - 10
Bair - 14
Uair - 7
Dair - 9
Nspecial (Ptooie) - 9 (as an anti-air, direct above the plant)
Sspecial (Poison Breath) - 23 (released, first tick of damage, some windboxes before this point)
Uspecial (Piranhacopter) - 13
Dspecial (Long Stem Strike) - 20 (no charge)