I came to US in 2017 March(H1 got picked in 2015, H1b validity till Sep 30 2018) and I got a job in August 2017. I had to change my employer for my job in September 2017. My employer filed employer transfer in September 2017 with an extension. In March 2018, my old H1b petition got revoked. The current petition got RFE in April 2018 and I submitted my RFE with proper documentation. After submitting, I filed Premium for the response. Today, I got my petition got approved till 09/28 which is my old I-94's validity period.
Now, I have few questions
1. Can I go to India on leave and I come back by 09/20 and file for extension? Do I need to go for Visa stamping again as I have my old and new I-94 still hold same validity date?
2. What are my chances of extension get successfully approved?