Selling and exercising options are two different things. But most people never exercise, just buy and sell. Check out the FAQ threads on r/options

I would definitely wait and look at the pre-market tomorrow morning. Your order won’t go through until open anyway, and there are 3 possibilities:

• Open price is higher (so your order wouldn’t have filled anyway)
• Open price is lower (so you would end up overpaying if you send it now)
• Price doesn’t change at all. Great, place your order. No harm was done by waiting.