It was barely breaking the surface in the morning, and by the time I finished work it was at full height. I was amazed at how fast it grew.
Not sure as to the mushroom identity, but when I've seen this happening with potted plants, it's usually due to the soil being too damp and needing to dry out more between waterings. The consensus on the houseplant side is that the fungus itself isn't bad, and neither is the mushroom itself really, but that seeing shrooms isn't common and probably triggered by wetness
