He sounds good, very humble at the moment.
not to be the Debby Downer, but it's been FOUR days. 96 hours give or take. his body has just begun to detox the alcohol out of his system. full detox takes 7-10 DAYS.
he will not be cured or even really on the road to a full vibrant recovery for a long time. and he will have to work, HARD, every day, to get there. 20 something days from now you will have a person who has not ingested alcohol for about a month. with some skills in how to NOT drink again.
quitting is not the hard part. STAYING quit is. your home may be the worst place for him.....and you. much remains to be revealed.