Hello from the UK. I don't actually know anyone over here with silvers, and I haven't been able to find an active UK quail forum
yet, hence I hang around here
However, I know that silver is recessive in button quail, and I would be tempted to guess that it is in coturnix (all the nice colours are ******) which would mean that unless your brown male is a carrier and has a silver gene then all of the offspring will be brown (happened with our buttons), but about half of them will carry a gene for silver so if you crossed them between each other, a quarter of those offspring will be silver.
If your male carries a silver gene, you would expect half of the offspring to be silver.
However, no matter what the expected percentages are, the chicks could all hatch with only one genetic combination, so even if all of the chicks are brown the male might still carry a silver gene. The more you hatch the more likely that the expected percentages will be expressed.
I'm sorry if this is all worse than useless, I don't really know all that much about it. If you try Google Scholar, they sometimes have scientific papers on the genetics of the different colour mutations.
Good luck