How much longer do I need to wait for the process to be complete

Not enough information to provide an answer. What petition did you file? Several unknown factors would determine this answer.

Going to Hawaii still part of USA can DACA holders can travel there ?

You will be fine as it's one of the states.

I forget to write "ATTN:539" on the envelope

As long as mailed to correct address, you are likely fine. Hopefully you submitted it early enough to allow for resubmission should it be returned.

My i-485 has been denied my employment authorization is denied can I still renew my employment authorization card

That's not possible. Consult with an immigration attorney who can advise you on whether the denial could be overcome.

You can't withdraw the petition, only your employer can. I agree though that dealing with the RFE would be the best course of action. A new...

L1 Extension while COS is in progress

Speak to an immigration attorney. I doubt your current employer will be all to pleased to spent a good deal of money extending your visa only to...

Your friends need to consult an immigration attorney, particularly the one who will be filing 3 different petitions but apparently hasn't been...

Can I apply for an Adjustment of Status after marriage on a B2 visa?

You can as long as you can establish that you did not have any immigrant intent at the time of entry into the country. Speak to an immigration...

Can I travel outside of United States as a Green Card holder? Do I stand a risk of being denied entry?

Chaos is correct. You are free to travel as a Resident. You do stand some risk but just how much is unknown at this point. I would monitor the...

Can we move on to a new employer after 6 years of H1B if we have active approved I-140 with the previous employer?

Consult with an immigration attorney so that you can get game plan for your future. It would be a worthwhile investment to have knowledge of your...