Are they arborvitea? Box shrubs?

I want to grow a dense shrub wall, just about 2-3 ft high, between my lot and my neighbor's. Maybe 12 ft long, 2 ft wide.

How long will it take to do this? Can I buy some and plant them close together, or do they need to just take the natural course?

I'm in SE Michigan, BTW. Probably not a good season, and if not, when?