Something like this should work ( This restarts it at 10 PM, I also haven't tested this).
*Can you edit your script so it looks better, it's pretty cluttered and hard to look at right now
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.org.shutdown</string>
<key>UserName</key>
<string>root</string>
<key>Program</key>
<string>/sbin/shutdown</string>
<key>ProgramArguments</key>
<array>
<string>/sbin/shutdown</string>
<string>-r</string>
<string>now</string>
</array>
<key>StartCalendarInterval</key>
<dict>
<key>Hour</key>
<integer>22</integer>
<key>Minute</key>
<integer>00</integer>
</dict>
</dict>
</plist>