We often say that the planets orbit the sun. But, in reality, they orbit the solar system's collective center of mass. How far is that point from the center of the sun?
The solar system barycenter, as it's called, is a dynamic point that moves (or the Sun moves relative to, depending on how you think about it) depending on where the planets are in their orbits and relative to one another (Jupiter has the strongest effect). There is a nice image from the barycenter Wikipedia article depicting the location of the solar system barycenter for a ~50 year period:
You can see that it doesn't stray too far from the Sun, maybe about 2 solar radii or ~1 million kilometers (it is after all 99.86% of the solar system's mass).
You can find its position using something like JPL SSD's HORIZONS.