Firstly, congratulations on the bubba, and I hope you enjoy being a SAHP.
Whilst my wee one is in daycare for 32hrs a week, as I had to return to work, I am in a similar position re: writing.
I find that I've had to function on less sleep (thankfully babies are good at conditioning you to this anyway!) if I want to write. I'll write after my wee one has gone to bed, or is having a nap on the days we are at home together during the day.
It's slow going (at least when it's a novel like me, and the occasional web content etc) and you need to have a supportive partner if you are going to write after bubs is in bed, as they kind of get ignored for the nights you are writing.
The thing is - when they are smaller, needing more sleep, they are actually easier to fit your writing around. As they get bigger - like my daughter at 1yr - they don't need to have as much sleep, and need more attention as they move around so much - you get less time during the day.
Sorry if I'm not helpful...but I can be sympathetic!