As others have said, the last item in the drop-down menu is "Funds for long term stay in Thailand." Choose that one.
Chances are very high it will be tagged correctly as a foreign transaction. If not, you might have to get some extra paperwork, but it's not a disaster. I've been doing transfers that way for years and only once has it been tagged incorrectly. And immigration (in my case) didn't care.
I had a woman fix my hat the other day. She sewed some stitches into the band. She didn't want to take money for her work. She said it was only a little work. I left some money on her table. Nice woman.
I would be hesitant to rely on the combo method being available unless you have confirmed it with your immigration office. The head of the immigration office I visit came out in a newspaper article saying the combo method is allowed. I asked an immigration officer and he said no.
I didn't push it as I went for the income method, anyway. Just be aware that what applies in one immigration office may not apply in another.
Air pollution is terrible in Chiang Mai. It's a risk factor for lung cancer, heart disease, emphysema, and stroke. It's my favorite city otherwise, though 😁
Typically takes 2-4 days for me. But I don't use it for speed. It works differently than places like Western Union. Wise matches transactions in your country with transactions in whatever country you're sending to. Sometimes that takes time.
There are a couple of different aspects to this question. One is if your specific immigration office allows what's called the combination method. Some in the bank, and some monthly income.
Since you said social security, I assume you're from the US. The US does not provide the documents you need in order to verify your social security income.
That means your first year, to qualify for a non-O for purposes of retirement, you'll have to put 800k in the bank.
During that first year, if your office allows the combo method, you can transfer your social security payments every month to your Thai bank account.
After a year of doing that, you might be able to switch to the combo method for your second year.
But it's best to ask at your specific immigration office..