Left my MacBook Pro lid closed and plugged in at home

Allan’s right. In fact last spring I left my office for a short spring break with my notebook plugged in and asleep not expecting the state to go into lockdown. I worked from home for the next four months using my personal desktop and notebook. When I returned to my office there was my notebook plugged in, charged, and ready to use just as if I’d left it overnight.

I think it's OK as long as your house did not have a power surge due a lightning strike. The battery in your MBP and the related power-managing software are designed to prevent overcharging.