First I don't think your dog will get any darker than his ears.
If it gives you an idea how a light pup darkens up over time -
This was my past boy. American showlines behind him top and bottom.
He looked like a white rat when he was a very baby puppy at 1 week old the first time I saw him.

But I pretty much knew he was going to be medium gold based on his mom and dad + based on his ears and a bit of nose.
I would not worry too much about coloring. The dogs darken up a number of times as they grow up and grow old. A 2 year old will be darker than a 5 month old. A 3-4 year old will be darker than a 2 year old. A 7-9 year old will be darker than a 3-4 year old, etc...