With the intent of trading only at times of maximum volatility, I'd like to objectively document and grade which periods of each day during the week are historically the most volatile (i.e. Median number of expected tick excursion per 15, 30, or 60 minutes). Does anyone have a suggestion for an out of the box Excel template/data source/setup for this purpose?

There is a whole thread on this topic:

Intraday Seasonality Volatility - When to Trade and When Not to Trade Specific Trading Times Each instrument has its specific times, when it can be traded, and also has its times, when trading does not pay off. The question is. how to determine the optimal trading times? The main criterion is volatility. If volatility …

Thankfully @Fat Tails also provides the indicators.