There are a number of New Testament saints that preceded Our Lord in death. Here are a few:Saint Joseph
The Holy Innocents
Saint Elizabeth of the Visitation
Saint Zachary
Saint Anne
Saint Joachim
Anna the Prophetess
Simeon the Prophet
Saint Dismas the Good Thief
St. Dismas, as he was the good thief who died on the Cross, & entered into Heaven alongside Our Lord.
A saint becomes a saint the instant they enter heaven. However, before the Catholic Church can declare them as a saint in heaven they carry out a lengthy investigation to assure that the person is, indeed, in heaven. This is called the canonization process,
There may be a St. Amber in Heaven however, there is no recognized saint by that name.
There is no specific saint known for waiting at the door of heaven. In Christian tradition, Saint Peter is often depicted as the gatekeeper of heaven, with the keys to the kingdom.
St. Michael is an angel in Heaven, he is a saint.
Saint Peter is fine and enjoying his life in heaven.
The definition of saint in the Catholic Church is someone who is heaven. Thus to say that someone is a saint is to say that they are in heaven, so the answer to your question is yes, it is a tautology.
I do not understand your question. If Francis Xavier is a saint, that means he is dead and in Heaven. He is doing whatever saints do in Heaven.
We must assume that Saint Nicholas of Myra is currently in Heaven.
Saint David of Wales is living in heaven.
To the best of our knowledge, she is in Heaven. That's why we call her a saint.
Saint Benedict of Nursia currently resides in heaven.
Saint Peter died and entered Heaven as a saint when he was about 65 years old.