MacBook Pro Battery

With Catalina 10.15.5, Apple introduced Battety Health Management that optimizes charging based on your usage, and will even run your Mac on battery briefly/occasionally while plugged in to maintain battery health.

About battery health management in Mac notebooks - Apple Support

Kerry_Lee wrote:

Hi, I have been leaving my MacBook Pro plugged in all the time. Is this bad for my computer?

No not bad. Your mac will never over charge.