Do you know if the Apple store handing them out?
Yes, you just have to ask for them.
It would have been helpful if I knew that Apple was handing them out when I bought my XS. I went to AT&T to get an eSIM today for ~$5 (not a big deal) but I could have avoided the trip to AT&T.
If not aforementioned: The phone cannot detect the eSIM until the phone already has a physical sim card. I could not tell why it could not properly scan the eSIM's QR until I put a physical SIM in it, then it worked perfect. I'm only using the eSIM now.