Does anyone here knows the number of Nebraska Service Center, wondering why our NOA1 is not yet delivered...thanks

Your petition has been transfered to California Service Centre. You need to give it more time as you are in the normal range. But the number is 1-800-375-5283. You will likely just get a standard answer.
NSC no longer processes K-1 petitions.

thanks a lot Nagishkaw just wanna give a try...

Since they cashed your cheque, you can create an account and keep track of any progress regarding your petition. Go here:
https://egov.immigration.gov/cris/jsps/index.jsp

sure thanks again

They just cashed your check last Thursday, so if they sent you an NOA1 it should be in the mail some time next week. If not, then you will have to wait 30 days before you can call to request one.