I140 status - Post 180 Days - In case of Job change before completing 180 Days

[cva]

Hello,

I am just wondering if we can rely upon on the status displayed aginst the I-140 receipt number shown in the uscis.gov site. I have seen some people stating in this same forum that the status is not updated frequently for all the cases on USCIS site, especially for the cases related to I140 revocation. 

how exactly we can know/check the status of I140 status without contacting the previous employer after a job change. does any formal procedure(s) exist? I do understand that I140 is more bound to the employer, retained by them and they can take any action in case employee leaves their Org. 

Fyi, I am 160 days past my I140 approval from my previous employer who has let me go due to unavailability of any projects to place me. 

Thanks in advance