That bloom is too far gone to be able to ID it. We would need pictures of buds and the bloom in all stages as well as leaves and the full plant to have any chance of IDing this rose.

Generally HTs have single blooms at the top of long canes but there are some that will produce sprays or clusters of multiple blooms from time to time. Grandifloras will cluster flower but will also produce those long stem individual blooms. The blooms are often smaller in size than HTs though.