YES

that is one of the reasons for K-3, to either wait for CR-1 visa, or adjust in the USA, EAD is an interim benifit available to K-3 before AOS, and EAD will expire when I-94 expires, usualy 2 years after a K-3 enters the USA.
Applying for EAD before AOS is recommended for K-3 holders, because of the 2 year EAD, if apply for with or after AOS, then only a 1 year EAD card would be issued.
SEE:
http://www.visajourney.com/forums/index.ph...mp;page=k1k3ead