4/9/2024: Sent the I-751 application package to USCIS.
4/11/2024: The package was delivered to USCIS.
4/19/2024: USCIS charged the application fee ($750) to my credit card. According to the USCIS website, they sent me a receipt notice.
However, since then, I have not received anything. It has been more than five week. Should I be worried about this?