Keyword tag is not working

Somedays ago i have added some meta tags in my WordPress site header. But now i feel the description tag is working fine but keywords tag is not working.
<meta name="keywords" content="Thebestwp,The Best WordPress,Best WordPress Themes,Best WordPress Plugins,wordpress,wordpress themes,wordpress plugins,wordpress website,google cloudwordpress,google adsense wordpress,wordpress web hosting,fastest wordpress hosting,adsense wordpress,create wordpress blog,wordpress hosting,ecommerce theme" />
I added this code in theheader file. But is not working. What is the wrong with this code.

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