The syntax of the access list looks ok - if the access list is applied inbound on the outward facing interface of your router or is applied outbound on the inward facing interface of your router.
You have the source address specified as the address of time.nist.gov, the protocol is udp, and the destination port specified as ntp, so that part should work. I would guess that either the access list is not applied correctly or that there is some line further up in the access list that is preventing the traffic before it gets to this line.
And of course there are other possibilities such as the possibility that you might not have IP reachability to the address of time.nist.gov or that there might be some firewall or something that is filtering the packet before it gets to the router where the access list is configured.
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