Hi Satish,
Your qualification looks pretty good except I'd change $DATE$ to $TIMESTAMP$. Now if you leave it like that it will continue to send notifications forever. I'd add a window of 10 minutes so that it only sends one notification (and then run the escalation every 10 minutes), like:
($TIMESTAMP$ - 'Expected Date' > 2*60*60) AND ($TIMESTAMP$ - 'Expected Date' < ((2*60*60) + 600)) AND ($STATUS$ < "Resolved")
Cheers,
tkj.