Here are some pictures I took.

Not much I can say, you seem to be doing a fine job. ;-)

With the dappled sun they are getting will acclimate them to direct sun.

Do not overwater. Let them get pretty dry before watering.

I've had better luck with this warmer weather and sun than I've had when it's cool and damp. Things dry out faster and fast draining bark mix keeps things moving inside the media.

When you water, use just a pinch (1/8 tsp?) of soluble fertilizer per quart of water. I also added a 1/4 teaspoon of Magnesium sulphate per quart. Conifers seem to like that, and I knew my water and soil is Sulphur deficient.

You know what's interesting? So far, three or four of them somehow became uprooted. I had to replant them into the soil. I don't think any wildlife got into my trays. I'm pretty sure the breeze did it.

I got a little frustrated & started thinking: How the heck do these things grow in the wild, on their own?! 😂🤣

Question: Should I bring them indoors for the winter?

If anything, birds used to bother my outside pots, looking for food I suppose.

I can't help you with the question, I always started my seeds indoors in late winter/early spring.

If I kept anything over the winter, I had a cold frame, outside next to the house. That protected them from our extreme cold.

Your climate may be different, but you never did say what part of the world you're located.

I'm from Southern Ontario, Canada (Niagara Region).