Lockbox Payment When Did You Receive The Receipt For Your I-130 With Currently Filed I-485 Immigration Form?

When did you receive the receipt for your i-130 with currently filed i-485 immigration form? - lockbox payment

Recently, an I-130 to I-485 brought safely to the right place in Chicago. I know you, because I was sent with the confirmation from USPS. But I wonder how long it takes for them to send me a receipt. Do you have to do any processing of my application before them, or simply send as soon as they see that all forms and payments that they are?

I know it is from person to person, but please tell me about your experience, how long does it only at the front desk to receive. I am very worried about this! Thank you.