July 14 (Reuters) - U.S. stock index futures extended gains on Wednesday after Federal Reserve Chair Jerome Powell said the U.S. job market "is still a ways off" from the progress the central bank wants to see before reducing its support for the economy. read more At 8:36 a.m. ET, Dow e-minis were up 49 points, or 0.14%, S&P 500 e-minis were up 12.75 points, or 0.29%, and Nasdaq 100 e-minis were up 94.5 points, or 0.64%.