! H4 to H1 COS Question!

I received an offer from Big 4 consulting today. I am currently on approved H4 which is expiring on 13-Feb-2021(less than a month from today). My H4 extension was applied on August 2020 and is pending approval.

My Question is will the pending H4 application cause any issues while adjudicating my H4 to H1 COS. Also, want to know if my H4 to H1 COS should be applied before H4 expiry (13-Feb-2021).

TIA for your assistance.