It means patiently waiting for good news or good news. Waiting for good news is an idiom, which means patiently waiting for good news or good news. The allusion of this idiom comes from ancient music competitions. Participants would tune their tunes before the competition, and then wait patiently for the competition to start, so that they would listen to good performances. It makes a sound of admiration, so there is the saying of waiting for good news. Now this idiom is often used to express the expectation and patience of waiting for good news or good news.