The strongest is the JPY. The weakest NZD
This is the look at the change as NY traders were entering for the day
 
This is the snapshot now.  For the USD, the currency has gotten weaker vs all the pairs.   The GBP has strengthened as has the EUR. The JPY has been a big beneficiary overtaking the GBP as the strongest (as measured by the accumulated change vs. all the majors).  The NZD remains the weakest currency as the RBNZ decision looms at 3 PM, with the new weakness coming vs. the EUR, GBP and JPY