Yes, that's a lilac, and yes, it is blooming now.
I noticed this lilac when I was visiting my folks a week or two ago. I was saying goodbye to Mom (always a long, drawn-out affair because one or the other of us thinks of something more to chat about...an hour later, I'm still standing by the car), when I glanced up past Mom's shoulder and saw a purple bloom at the top of a shrub.
"Is that the lilac? Blooming now?"
We wandered over to verify it, and sure enough, it was. I've never heard of lilacs blooming in September. Another reflection of this year's unusual weather.
We also saw one of the early spring primroses in bloom. Hmm...curiouser and curiouser.