Question about Subsidy

I don't know if this is where I post this.. I'm new to this site. I'm adopting my niece. It's been over two years. Her parents rights have been terminated back in June. I was told then, I was going to receive subsidy payments.. Well, I finally was able to sign up for it the other day.. I was also told they would backpay me.. Is this true?? Also, I signed up for direct deposit, will that be where my first payment goes? Or is it a check? I asked my worker, but she takes a week or so to even get back to me.. :/ I'm just curious if I should be watching out for a check or what.. Thank you!!!