Check that a new (based on date and time) and complete output file exists (based on viewing the bottom of the output file)

once the output is complete, determine if it makes sense by checking the resulting heads, flow rates and budgets

How is the mass balance?

Do the results make sense?

Ask what is wrong with this simulation and how can I improve it? Then you can be pleasantly surprised when you are satisfied with the result, but you won't overlook small problems because you will start from the perspective that looking for problems is your mission.