First of all - best of luck !
Starter packs of formula - cow & gate, aptamil etc. Then you don't have to waste precious time when you could be sleeping, sterilizing stuff in the ward kitchen.
A charger for your phone and ipad.
Specs if you ever wear them. I'm someone who needs them for close work but can read a book normally without one. Couldnt focus to read a thing I was so tired in hospital
I came home in non-preg yoga pants. They were by far the most comfy thing on the scar area in the first few days. Non preg is important as you won't want to wear preg trousers with a tight elastic band.
Not to scare you - but you will basically feel like someone has kicked you in the stomach or you've attended the abs work out session from hell and it's post session. day 2. It will hurt to cough/laugh for a couple of days and you'll suddenly realise how much you use your stomach muscles on a day to day basis, even when heavily pregnant. So - stick a spare pillow in the car, an electric fan, several bottles of water (sports cap preferably), snacks.
Essentially you will want to be comfy and have stuff to hand so you can minimise moving as much as possible for the first 48 hours. Shuffling up in the bed to BF with a baby in one arm was pretty sore. Get someone to hand you the baby or make sure you are sitting up bolt upright to feed him/her even with a bottle.
Physically, it will be as awkward to move for the first week as it is now while heavily pregnant. So you'll need cushions behind you etc as you lever yourself into a chair.
Disposable changing mats are great - you can then change the baby in the cot which is higher than the bed level
Request a baby cot which rocks if you can nab one. You can settle a baby with a gentle push then.
Get visitors to come (if coming from home) with fresh food so you can keep your bowels moving.
My MIL [bless her] sent in tupperware boxes of chicken salad, freshly squeezed orange juice with ice, and other goodies. I had DD in a heatwave too and it was boiling on the ward. The hospital was serving shepherds pie......
Otherwise, the normal stuff applies. Just make sure you are getting more than paracetamol and don't underplay your pain or that's all you'll be sent home with. You don't HAVE to use it at home, but if you overdo things when you get there, you'll want it.
Re your timings. It seems to take about half a day to do a discharge so it may depend on what time your section happens on the Friday. You will need to be signed off, as well as all the baby checks. Then your prescription will go off to the hospital service and you can't go until you have your meds, a sharps box and anti coag jabs demos]. You might find that you don't get discharged until very late 8-10pm on the Monday night.