Subject: why we don't already have lab grown meat?

why aren't people producing lab grown meat for consume? put a small piece of cow
flesh (no need to kill the cow) into a tube with nutrinte flows and stuff plus
cow stemcells and a lump of meat would start to grow there, right? (I know that
there are more details involved, but  scientists should be able to figure out
how to patch the small holes on my idea)

ps:is this the right category for this question?

Re: why we don't already have lab grown meat?