-It is very risky for you to leave US before you do the fingerprinting. Your green card probably will be cancelled if you don't have reentry permit in hand when you reenter US.
Read this article to see whether you can request an expedited biometrics appointment:
http://lawandborder.com/guam-or-honolulu-bound-biometrics-appointment-options-for-reentry-permit-applicants-living-overseas/
请有经验的人帮忙执教,十分感谢!