Once you have pressed the 'Deploy' button in Director, there will be a slight delay before the signs you have deployed appear on your end-point screens.  This is because it takes time for the signage devices to detect new content, and then download and display it.  

The size of the delay will vary depending not he network bandwidth, and the amount of signage data that needs to be transferred.  

There are a number of ways you can check that your new content is being shown on screen.  Please see the following link for details: https://www.signstix.com/support/how-can-i-check-that-my-new-signage-is-now-being-shown/