2348 cM match, potential half sibling

My husband is adopted. He discovered someone who was apparently a first cousin (according to ancestry).

He was kinda nervous about instantly seeing his birth parents so it was a relief that it said this because a first cousin isn’t super close.

He sent a message and didn’t get a reply yet.

Then, I did some digging and realized it’s way closer of a match than a cousin…. More like a half sibling or potentially even a full.

He messaged again saying “yeah it looks like we’re closer than we thought…”

No reply still! And the guy has no pic or other info. Ahhh the suspense is killing both of us.

Anything we can do beyond just waiting patiently?