F2 to H1B extension after I140 approval


My PERM was filed in 6th year and it got approved recently and waiting for I-140 to be filed. My 6 year H1B is already expired in July’2018 and I have moved to F2 using COS. I have following queries.1. Can my H1B extension filed in premium processing at Nebraska center in current situation ?2. If my H1B can’t filed in premium processing then Can I work on H1B receipt after my I-140 gets approved and H1B extension is filed in regular processing ?3. In worst case, if my I-140 doesn’t get approved then can my H1B extension filed on I-140 appeal receipt ?Thanks,