I wanted to add that the current version running on your hardware can be found in the Organization > Firmware Upgrades page on the All Networks tab. Or also on the individual status pages of the devices themselves.
I feel better implementing a stable release and not a Beta on my network infrastructure, I also wait at least a month before implementing the stable once they release. I have had to roll back releases before on other non-meraki products and its normally the best practice. Ultimately its up to you.