After seeing what I saw from posters like StanKlown and multiple anti-Trumpers here on the flip when Herman Cain died, and when Rush Limbaugh died, I would objectively say that it's *never* too soon.
Besides, it's not like the cancer would have killed him anyway.
Although to be fair (again, nothing a Dimotard here on imgflip has EVER said!) he apparently had multiple myeloma, a type of blood cancer that could have affected his immune response to the vaccine.