The average gestation of triplets is 34 weeks.
So in terms of delivery, since they are much smaller than full term babies then in some ways the birth could be easier.
However it's so high risk. It will depend in how/when you go into labour and what condition they are in. I'd imagine that emcs are quite common with triplet births.
If you get to 37 weeks they may want to do an elcs so they can plan during normal hours when there is more cover/a consultant present. Lots of staff will be present so it will take quite a bit of planning.