I'm not an expert, but I Have done woodwork where you can't see a seam. From what I've read, and what I've done with gunstocks, it looks like your patch looks a bit small, gaps around it, and It appears to be a different wood.
the issue is that the glue, and different wood take pressure differently than the original wood. you can mitigate this by having an extremely thin, can't see with the naked eye, seam, and, at least with heavy recoil rifles, you always use the same wood. I've seen good stocks explode in the rear grip area when a different kind of wood is spliced in.
Because of that, I would be inclined to give the glue the time it takes to get to it's full strength. However long your particular glue takes.
JS