Whatever you're talking about, don't do it.
A $100,000 option fee? That's absolutely insane! An option fee typically is 2%-4% of the purchase price of the property, although of course it's negotiable. If you're a Realtor acting as a buyer's agent, you're doing your client a severe disservice. And if you're the listing agent, check with your broker.
A 12 month lease-option? No way, especially with a $100,000 option fee. That's--well, I was going to say criminal but that's not true until the 12 months are up. If you're that sure that the deal will close within 12 months, then just do a standard option. Understand: You should allow 90 days for the entire closing process. That means the buyer needs all his "ducks in a row" in 9 months--and obviously doesn't yet, or he/she would be buying today. A 12-month lease-option is risky in any case--lots of things can go wrong--and if $100,000 is at stake, the only answer is: Don't do it.
If you're that sure the purchase will close, then do a lease-purchase. Get all the paperwork signed. Then escrow it. Make sure it's all iron-clad.
You ask "When can someone get paid"? Who's the "someone"? If it's the seller, he/she gets paid when the buyer gets a conventional mortgage. If it's the agent, there are a number of ways to work that. It can be--and often is--paid at closing. However, the seller can also use some of the option fee to compensate the agents involved. Basically, paying the commission (or part of it) out of the option fee.
If you're a Realtor, check with your broker and a lawyer before going one step further. If you're the buyer, one word: Don't.
Hope that helps.