Meta tags are probably not showing because Google hasn't crawled your site again yet. Make sure Google does that often on your site. Here's my suggestion:
Start using, if you haven't started already, Google's Webmaster Tools tool. Google "Google Webmastertools" and you will find the link to their site. After you sign in/login, you will be prompted to authorize your website to use WebmasterTools (this is a security precaution to prevent others from getting statistical data about your site). They will craw your site more often if you do that, I think, but I am not so sure. For that reason I use XML Sitemaps and send them to Google. In XML Sitemaps you can specify how often specific pages on your site are updated. This can come in handy if you have pages getting updated often or new meta tags being generated often. You should try that.