What does the author mean by stating that "the Negro Leagues Baseball Museum is about to hit a home run"?

she means that the museum is going to get bigger and better.

Explanation:

In "A Museum of Their Own", the author focuses on the circumstances that led to the establishment of the Negro Baseball Museum in Kansas City.

Therefore, when she says "the Negro Leagues Baseball Museum is about to hit a home run", she means that the museum is going to get bigger and better.

She claims that the officials of the small museum has unveiled an ambitious project of 15 millions dollars which would expand and renovate the small museum into a library and research centre as well.

they can increase to boost the enonomy.