Since you only need to run a single command as a user open terminal and give command ‘crontab -e’. If you haven’t set an editor it’ll ask for one, pick nano.
The syntax for crontab is like this (man 5 crontab will show it on your system as well):
<pre style="background-color:#ffffff;">
<span style="color:#323232;">field allowed values
</span><span style="color:#323232;">----- --------------
</span><span style="color:#323232;">minute 0–59
</span><span style="color:#323232;">hour 0–23
</span><span style="color:#323232;">day of month 1–31
</span><span style="color:#323232;">month 1–12 (or names, see below)
</span><span style="color:#323232;">day of week 0–7 (0 or 7 is Sun, or use names)
</span><span style="color:#323232;">command to run with full path
</span>
I’m not sure if sct is really at that path and I don’t have that installed, so verify that first (run ‘which sct’). Save the file and exit editor (ctrl+o, ctrl+x on nano). That’s it. However, I don’t quarantee results with that, since X with environment variables and all may cause issues, but if that’s the case I’m sure this community can help with that as well.