First, it's always good to celebrate and reward accomplishments. The only word of caution; put the emphasis on people, quality and customer service first.
I am not suggesting that the numbers of the business are not important, they are. But you must reach people but rewarding the intrinsic values people have: Self motivation, helping others, team work and the desire to perform at one's best. When you promote these attributes, the rest will fall into place.
Now, with that said, every business is different with what it needs to be successful. Some of the key numbers that shops need to track are: ARO, part profit, labor profit, shop/tech efficiency, shop/tech productivity and your expenses.
There are benchmarks, but to be honest, I am not sure if using benchmark numbers should be used without understanding your business. I recommend speaking to an accountant or taking a shop management course for shop owners.
Common benchmark number for the most common KPI's: Part GP: 50%, Labor GP: 70%, Expenses: 40%, productivity 80 to 90% and efficiency: Over 125%.
BUT PLEASE, these are common benchmark numbers, I strongly advise you to do your due diligence on your business.