The second Micron boise fab hasn't even broken ground yet, they are still working on the first one. So don't expect these things to be completed in parallel.

Some of my family is pretty happy, though, with the job security as they are pretty convinced these projects are all going to take much longer than what's being stated publicly. Micron is saying the first chip from the new fab will be in 2027... though they also predicted it'd be 2026. The date seems pretty slippy.

Anyone who has been around the semiconductor industry since the last century will remember various huge fabs e.g. in Arizona that were partially built but never finished due to oversupply by the time the walls and roof were done.