Perhaps I can apply a little Saints 101 to shed some light on the topic. There are two reasons a person is canonized. The first, is that they are believed to be in Heaven. That is easy enough. Indeed, there are far more saints in Heaven by order of magnitude than will be canonized. So there needs to be a second reason, namely, that they offer some example to inspire the Church today. There is no doubt being well known aids in being canonized, but as pointed out, that has nothing to do with how God sees us. Some of the highest exalted saints will be those no one has heard of, much less been canonized.
But what of the two under discussion here? Mother Teresa gave her life to help others, the poorest of the poor. Perhaps some of these are with her, or more greatly exalted in Heaven. That is God’s deal. For us, she serves as an example of our responsibility to the poor.
St. John Paul, risked his life to become a priest, studying for the priesthood when getting caught meant death. There could be several things we could look to that he did, so I will just point out what I look to him for inspiration. He shows us that even the elderly and infirm are of great value to God. Working in his final years despite his Parkinson’s, up until his death.
So we believe these two to be in Heaven, see them as witnesses to hope, and they have been canonized.