J1 Visa Extension


I am a J1 visa holder and currently waiting for my waiver. DoS received my No Objection Statement from my home country and is currently for deliberation. My visa will expire on June 2019. My visa sponsor is offering an extension of 2 years J1 visa. Since I am planning to go back to my country for my formal wedding, my questions are:

1. Can I accept the extension so I can go back to the US? Does it mean I need to waive again the 2 year home requirement?
2. While waiting for the USCIS approval notice, can I start my Adjustment of Status and application of Advance Parole?

Thank you in advance!