IP block in mikrotik at specific time

Hi Mikrotik Experts ;
I have a NVR CCTV device that wants to block access to some cameras at certain times.( DISABLE 8:00AM - 4:00PM )
I have a regular switch and the bit switch and device are a HAP LITE routerbord.
What script to write?
Thanks everyone

example

/ip fi filter add chain=forward action=drop protocol=tcp dst-port=88 (port cctv) time=8h-18h,sun,mon,tue,wed,thu,fri,sat

Not enough information.
You want to block access to cameras from within your local network or prevent access to them from internet?
Cameras are connected to your NVR Ethernet ports or to your dumb switch?