GC process on CPT

[Arasun]

Hi,

I am  an IT professional in Atlanta, GA. My H1B petition for FY2019 was picked and rejected due to misprinting of routing numbers on the checks. My employer opened a service request to reconsider the case which we did not hear back from uscis yet. I have consumed my stem opt period and have to enroll into college again.

Recently my employer reached out to me saying they will initiate GC process along with this year H1B filing . I just wanted to know is it possible while iam in cpt status to file GC? What will be the implications if my I140 is approved and my h1b doesn't get picked /delayed in approval? Any other things i should worry about?

Thanks..