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Dear experts,

I am seeking your advise in regard to the following matter:

1. I-140 has been file while a person in the US. Now it is taking a
very long time to get this form approved. Can this person leave US
while waiting for this form to be approved and once it has been
approved apply for a green card in the US consulate abroad ?

2. If the answer to the first question is NO can this person wait
until the I-140 approved and then leave US and apply for a green card
in a US consulate (I-485 also has been filed but it is taking even
longer than for I-140 to be approved).

3. What happens if the priority date for I-485 will be reached before
I-140 is approved ?

Thanks in advance