You should have asked that question during the interview
The bad news is: If they didnt finish security checks.you will not get anything. So iot can take long time. If no complications - usually 1-6 months.
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Up to 6months if they even give you one
If you are approved at the interview it takes less than 30 days to get the green card. They say it can take up to 6 months. But i was told once before to call the immigration office if I did not receive with in 30 days. And NO NO NO you cant travel immediately after the interview because you can go somewhere and get stuck and not be able to return. So whatever you do wait until you get that greencard before you travel because trust me it does wonders at the border.
It takes about six months. You can travel after the interview as long as you have the stamp on your passport. ( I did it )