I had an elective CS when my firstborn was just over 18mo. My then huband went back to work 2 days after I came home and I was surprised at how well I coped tbh. I was sent home with just paracetamol for pain relief (DD2 born on Monday morning, we came home at Thursday lunchtime), took 2 over the course of the next 2 days and although obviously I wasn't my normal active self I had no real problems. I was hoovering the entirety of my 3 bed house within 3 weeks, carrying the vac up and down stairs and did so with assistance with the carrying within about 3 days of coming home. (By god it needed it by then, I had 2 dogs as well as a toddler!).
I don't know if my experience was unusual, pwehaps other mums who have had an elective CS can comment? Also, maybe the fact that mine was elective, as yours is to be, made the difference. Possibly things would be harder if it was an emergency CS?
All that said, my ex husband was a complete ass and left me to it... I'm sure that yours is not like that and will support you and help all he can. If he's doing so and is absent for just a couple of hours here and there I'd very much like to think that you'll be absolutely fine.
One bit of advice though... if and when others offer to help, by taking your toddler for a short while, shopping, cleanng or whatever, don't feel rude in saying yes. Such help will be precious and very valuable.
Good luck, I hope it all goes as smoothly as my CS did.