Do you mean do they know before the judgement is rendered to the other person? That is, do you mean do they know, for instance, your eternal fate even before you’ve died and gone to judgement?
Or do you mean to ask if they become aware of the judgement as it is rendered after your death?
I would imagine that they become aware of the judgement of others when that judgement is rendered, since all in Heaven are in complete union with God.