I'm planning to only travel 2 weeks to outside US and will mail out immediately my ROC/i-751 application once I arrived back the US which it will be a month before my GC expires.
This was just a plan, I haven't even buy a ticket yet until I give birth of my 2nd baby on September 2023.
So, one more question to clear up my overthinking mind. If I file the I-751 before I travel, when I get the extension, can I travel outside US and when I reenter the US, I will just show the POE officer the extension letter?