You will not get a Green Card. You will receive a visa in your passport. Your wife can fly back to the US after she has submitted the I-130 to the consulate. Make sure she has completed the other documents such as the I-864 with supporting documentation as required for you to have. She must enter the US either before you or at the same time......so yes, she can fly back early.
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US immigration requires a great deal of knowledge, planning, time, patience, and a significant amount of money. Given what you have posted, I would take a different life journey. Good luck.