It's been almost 2 months since I filed my US citizenship application. Other people who've applied to the same center (St Albans, Vermont) have already been sent a notice of receipt of application from USCIS. Although I did get confirmation of package delivery from the USPS (I included delivery confirmation), I have not heard back from USCIS saying that they've recieved my application and are processing it. I was wondering if anyone knows how long it typically takes for me to get the receipt confirmation. Should I be concerned, and is there any way for me to obtain the receipt number, so that I can check the status of my application online. I would be grateful for any suggestions.