Preparations for it can only be made during one s life. When one dies, one no longer prepares anything for the life to come. There is, thirdly the emphasis that it is action and good deeds which make all the difference when that hour comes. The man acknowledges that he has not prepared much, except to love Allah and His Messenger. It is not enough for anyone to sing, recite, or even compose a poem extolling the Prophet beyond any measure.
Words count for very little.
It is how conscientiously one follows the Prophet by conducting his life according to his teachings that really proves that one loves the Prophet. Otherwise, it is extremely easy to spend a couple of hours everyday repeating expressions of love. That does not require any effort. Heaven is earned only through great efforts. Martyrs are admitted into heaven because they make the greatest effort of all to demonstrate their love of Allah and the Prophet.