The only good thing about a delay assuming it is short is that Professor Ford’s credibility is going to be hammered when she testifies. Also, Kavanaugh’s own testimony will be bad for her and good for him.
Best thing for the Democrats is that she doesn’t testify and that the Republicans are blamed for her not testifying.
If she does testify it will certainly be in private. We will never get to see her demeanor or hear what she says and the Dims will misrepresent what happened. It won’t help the Republicans’ case at all.