I personally don't increase feed at all for my KKs, but change them over gradually from sow rolls to sow & weaner 2 weeks before their due date.
I then slowly increase post farrowing by 1/4 lb per piglet per week until weaning - I don't use a creep, so as the piglets start nibbling at 10-14 days mum gets less as they eat more feed!
Obviously fresh water always accessible, with additional fruit, veg & bread (as available). When no grazing available I top-up with approx lb soaked sugarbeet/grassnuts/hay/silage per day.
Everybody has built up a "maternity kit" as best suits their/their pigs needs - the things I always have available for farrowing are; fully charged mobile phone (incase I need to "phone a friend" or the vet - make sure yours knows when a litter is due, in case they've only got a small animal vet on-call

-speaking from experience here); flask of coffee, chair, torch & blanket (for me

) iodeine for the cords, cotton for tying any odd bleeding umbilical cord, OLD towels or T-cloths for drying-off the piglets (make sure they ARE old ones - not your OHs new/favourite ones

), antibac gel (incase I have to go in - remember antibiotic jag to prevent any infection afterwards) & a 4-pack of sweetheart stout (to calm mum if needed, if not I will

). A heat lamp can be handy if it's very cold or damp, though I only use it in the winter for the 1st 2 weeks max. I don't keep a supply of oxytocin, as I have a friendly farmer closeby & I have only ever had to use it once for an overweight, older "rescue".
As the piglets pop-out it's a good time to quickly check for any jaw deformities/cleft palates etc - they can often draw blood (mine) at a few days old.
But ...
Much as I try to be with my girls when they farrow (I check for milk twice a day from about 3 days before their due date), I've been caught-out a few times & returned to find it all over & mum & babies are all doing fine
Hope everything goes well for you & Margot & there's the sound of many little trotters soon