Good idea!
NTP is now more important, not just for people to be able to look at the time on their phone, but also if you have all of your SDS shared systems running various times then it can lead to problems when concurrent changes are made, and your database ends up a mess. I've seen the end result of it going bad from differing times.
It is also a good practice to block NTP access to everything except for one device on your network (voice and data), let that sync to a pool server or GPS clock, etc, and then point everything on your network to that one device.
A good practice is to make this internal " ntp server" your main router/gateway for the network, as generally everything can talk to that.
Slightly OT, but you should also ensure your Active Directory domain controller and PC's are sync'd up as well to a time source, as having that stray off by too much can stop computers from being able to log on.