help with meta tag keywords

hi,
i am spending some time on writing meta tag keywords for my products , but i came to know that most giant search engines like google, bing does not support these meta tag keywords any more. can anyone tell me does writing meta tag keywords help in ranking in search engines or they are no longer valid and i am just wasting my time.

There are probably better uses of your time to be honest.

it means meta tag keywords are no longer useful in ranking?

Waste of time since 1998