Upon filing Form G-1145, E-Notification of Application/Petition Acceptance, you will receive one e-mail and/or text message for each form you have filed.
USCIS will send you the electronic notification, or shortly e-Notification, within 24 hours after they accept your form for processing. However, note that before accepting your application/petition, USCIS will review its completeness and process your fee payment. So accepting the form may come a few days later of actually receiving of your form.
Also, please note that undeliverable e-Notifications cannot be resen.