Weaning?

With the one year mark quickly approaching I'm so nervous on weaning off breastmilk. I exclusively pump and have been counting the days until I can unplug but my baby is still drinking 35oz a day! And he eats 3 meals a day! He wake up 3 times a night still so I thought I'd still pump at night but how am I going to know if he's eating enough? And will I switch the day bottles with cow milk because 20+ oz of cows milk seems like a lot.. ughhhh help 😭