The sun will die in 5 billion years. Will humans be alive then?
Not at the rate we are going.
We would be at spread out probably throughout the Galaxy and neighboring galaxies.
Our descendants that long in the future will probably so different that they can't be called "human". The only reminder of humans in our current form billions of years from now will probably be the golden records on voyager probe as it drifts endlessly through the universe until the end of time.