Better to wash and sterilise nearer to birth. Maybe can just throughly wash first and sterilise one time before edd. Then when u need to start giving bottle to baby sterilise again on tt day itself.
I only started washing when baby is home. Anyway drying and sterilise takes 30 mins for mine (Haenim). I wouldn’t wash too early, maybe a few days or 1 week before EDD is good enough.