It does look like it, yes, but I'm dreadful at ID. It's not bluegrass, which has a boat-prow tip.

Thanks for the input. If it indeed is Perennial Ryegrass, I am very surprised how fast it has grown. I put seed down ten days back.

That's evidence that it IS PR. It sprouts and grows very, very fast; often 5 days sprout in warm conditions. Right now, where I am, it wouldn't sprout at all (too cold).