I think information on this web site is reliable. I don't know anybody in this firm but people told me they have a great reputation.
Lesson learned is always make sure to check with a third party. If two lawyers from different unrelated firms say the same thing, I will assume the information is right.
http://www.hooyou.com/lc/faq.html
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Q: Can a Company apply for a Labor Certification on behalf of a person who is not currently an employee?
A: Yes. The Labor Certification application is filed for prospective employment. You are only required to work for the employer when you obtain the green card. You do not need to work for the Company-petitioner while the Company is petitioning for you.