I’d wait another year.
At age 3, my kids still had fun in the ski nursery, playing games with the other kids while spouse and I skied. You can still have a good vacation.
Also, it’s one thing to introduce skiing to a young child and another to expect him to tolerate several days of it. Start slow, like one morning and see how it goes before you add an additional day.
If you are going to start at 3, make sure he is fully potty trained or that will be a big pain to come off the mountain and try to derobe in a hurry. Offer a good reward for an hour or so of effort (like hot cocoa). If he is the kind of kid who is self conscious or hard on himself, wait - you don’t want him discouraged if his first experience is a lot of falling.