You will get some more texts/emails in a day or two mentioning that it is being mailed thru USPS and that USPS has picked up. You may call L2 at that point. But I wud suggest to just relax as once you get the USPS pick up text/email the card will be in your mailbox in 2 or 3 days max. The last text/email is when USPS confirms delivery to USCIS.
USCIS needs to be commended for streamlining the whole process. They have become super proactive with all the case tracking.