The white masking gene is recessive so if the mother wasn't a carrier he shouldn't be white. And if she is a carrier there is still a good possibility he wouldn't be white.
Agree it will probably become really obvious as he gets older.
Always so much to learn.
To the OP , when I looked at the pics more closely he looks like he could be a sable. His mom looks like a sable from the coloring around her neck, but I could be wrong. ) Research sable german shepherds. They look a lot lighter when they are young and then change color as their adult hair grows in. What threw me off is that usually the german shepherds have a mask on their face but this is not 100% .