You can use the Clock block to get the execution time. Then use a comparison block, which compares the execution time with your wanted time stamp (e.g. 0.2s) such that it gives a 1 when 'time > 0.2'. Then you can use a triggered subsystem with the outputs on 'held' to store the signal value and then use a regular Display block to display the value.
Alternatively, you can enable 'Cursor Measurements' inside a Scope and enter the requested time stamp manually. It will show the corresponding signal value.
