Even if you can't come to US from Dubai during escrow processing, You can use POA.
Usually escrow closing in 2 weeks with full cash purchase and 30 days with loan.
If you are considering mortgage loan,most lender requires Passport,40% down of purchase price and US bank account that shows full amount of down payment.
Those r normal processing
so you might have additional question,please feel free to contact me at any time by email.
Sr. Mortgage Banker
NMLS # 659743
Begin by identifying an agent that can provide sample property from the area you are interested in. They will be able to guide you through the buying process.