Song written by Mack Gordon and Harry Warren for the film Orchestra Wives , famously covered by blues singer Etta James in 1960 (2,4)
I believe the answer is:
at last
(Other definitions for at last that I've seen before include "Finally, ultimately" , "In the end, after much delay" , "working as a cobbler?" , "Finally, after much delay" , "None too soon" .)