Plant the germinating seeds now. The longer you wait the greater the chance of damaging them and inviting pathogens. Trees in general, including spruces, don't like to be transplanted as young seedlings, especially in their first month of growth when they are most vulnerable to damping off diseases.
Even now, you need to be very gentle with the developing seeds. Don't push or press them into the soil. Place them, put soil on top, an water to settle the soil. If it were me, I would plant all the ones that look black in the pic now. The ones not yet cracked open will grow, if they are viable. Don't bother with the lighter brown seeds: those are not good seed.
