SFI Options Expire Worthless

About a month ago, I sold some call options for some SFI stock I own. Those options had a strike price of $55 and expire tomorrow. Unless the stock shoots up 9 points in the remaining 3.5 hours of trading today (highly unlikely), those options will expire out of the money and I won't be required to sell my shares. I get to keep the $625 I got for selling the options (actually, around $611 after commissions) and on Monday I can turn around and do it all again!