Hello! Idk if this is gonna be really helpful but if you sent it through USPS and don’t have a USPS mobile app, maybe try signing up so you can monitor it via informed delivery? I’ve been anxious like you waiting for the I-797 because I’m set to travel at the end of the month but mine was delivered on 1/5 at Carol Stream, IL. Received the email and text notif that they received my case with the case number on 1/9. But like @Misscloud said it will take 1-2 weeks and sometimes a month before it arrives (I tried inquiring for it yesterday via the USCIS website but it says wait for 30 days lol).
I’ve been checking informed delivery everyday since I got the case number (I know I know 🤣). An hour ago I checked it again and there it is. It says it’s arriving tomorrow.
Hopefully you receive yours soon! Good luck!