I am Canadian, My husband (US Citizen living in Philadelphia) filed the I130 for myself and my son on January 26 through our immigration lawyer. I think the lawyer filed it online.
On February 4th he recieved a receipt of filing letter in the mail with our receipt numbers.
It shows a priority date of January 26 and a notice date of January 31. It is apparently being processed at the Potomac office.
That is the only thing we have received so far.