They are under no obligation to notify you of the progress of your rescission. All you can do is watch the credit card account that the down payment was charged to. That is where your refund will be returned, and it can take up to 45 days. It will probably be sooner, it just depends on when in your billing cycle the refund is posted.
Next. . . .? . . . Go celebrate. Start shopping for a resale if you still want to timeshare.
Jim