Note that in the real world it's going to have much less than 48MP of monochromatic spatial resolution due to aberrations.
Even if the lens was operating at the limit of physics, you'd get a 2 micron first ring of the airy disk at 500nm, which is bigger than the size of the pixels. It can help a bit to have pixels smaller than the smallest detail the lens can resolve, but at the same time the lens isn't operating at the physical limit, so there is probably only a small increase in spatial resolution.
Even if the lens was operating at the limit of physics, you'd get a 2 micron first ring of the airy disk at 500nm, which is bigger than the size of the pixels. It can help a bit to have pixels smaller than the smallest detail the lens can resolve, but at the same time the lens isn't operating at the physical limit, so there is probably only a small increase in spatial resolution.