Benedict XII tells us that those who have died and have been purified or are not in need of purification are in Heaven, even before the resurrection. This is a place of surpassing beauty and where we will be in a union of love with God without any mediation.
We must still be resurrected on the last day, since we were created to be a union of body and spirit, but Heaven is still a timeless part of our progress into our eternal reward. We know that there is some bodily component to Heaven, as some there, such as Moses and Mary, were assumed bodily into Heaven. The body there, however, will be different from our bodies here.