According to predictions for the Sun, how far might its radius swell during the Red Giant phase?

Answer

It will consume the orbits of Mercury and Venus, and may extend to Earth's orbit

Astronomers calculate that when our Sun enters this phase, its radius is expected to swell so much that it will consume the orbits of Mercury and Venus, and may extend all the way to where Earth currently orbits.

According to predictions for the Sun, how far might its radius swell during the Red Giant phase?
evolutionsunhydrogenstarexpansion