Reward Points already has that feature built into the side box if you have it switch on. Go to tools/layout boxes and switch it on Box Name: reward_points.php. This will show the customer what points they have in there cart and how many they already have earned if any. One more thing is if you go to admin/modules/order total and set the ot_reward_points to Automatic it will show the customer how many points they have on the order page.
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