Donating to a milk bank

I recently learned about a milk bank in my area and was curious if anyone has experience in donating their milk? I had plenty extra with my first and am expecting a similar situation when my second is born. I'm interested in donating, but would love to hear from someone who has done it before. Thanks ladies!

This is the organization in charge of the milk bank in my area:

https://www.hmbana.org/