Hey Scott,
You can export your notebook to a .py file by going to File > Download As > Python (.py). You can then use ArcGIS Pro's python environment (C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispro-py3) to execute the python file.
The following article will walk you through how to set up Task Scheduler. For the program/script portion, you will use C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispro-py3\python.exe instead of C:Python27ArcGIS10.2python.exe.