Do not forget this one thing, dear friends: With the 'Forge a day is like a thousand years, and a thousand years are like a day. The Update is not slow in keeping its promise, as some understand slowness.
The shields aren’t really necessary (in my opinion, of course) - the rubber gasket over the slot covers it completely, so it’s safe (unless you have something in the slot). I think the shields are more for settings where Pro owners want to convert the Pro into a “Type 1” laser device for legal reasons, like in a school or a MakerSpace, where insurance/liability might be an issue.
GlowForge has said that they will ship the shields for free to all Pro buyers (that didn’t receive them) when they are available.