Filled I-140 on Premium Processing....Receipt Notice not received been 6 days. Anybody been in this situation before? Any advice?

Yes, I think I got my receipt after 8 days and was approved 2 after that. Its normal

PP takes not more than 15 days.

What are chances for I-140 to Denied?

The common RFEs in I-140 are: your education, your prior job experience,and company's ability to pay. The first two - education and your prior job experience depend on the PERM application. What were the minimum education and job experience mentioned in the PERM application for this position? If you have 3 years bachelor's degree from outside US, you will run into RFE. But if you have US degree in the required field as mentioned in PERM, then you don't have to worry.
If your company is already paying you the prevailing wage as mentioned in PERM, then you don't have to worry about company's ability to pay. If not, then your company has to prove that they are in good shape financially to pay you by providing their tax filing to USCIS. So, if your company is not generating enough revenue, then this will become a problem in I-140.

These are the three things USCIS consider carefully while making decision on your I-140. Hope it helps.

@Madanbahadur

Thanks for your response....Do have US degree..Job mentioned on PERM does matched....And submitted 3 yrs W2 (its matched the PERM) and last 3 pay stuffs to met that Ability to Pay criteria. So don't have to worry right?

Yup, no worries..