Nagoya -> Osaka -> Tokyo

Hello there!

1.) I would suggest activating your JR Pass on 7th for travel to Osaka and later on to Tokyo as well. This is by far the most expansive travel in your itinerary. Do note that it is slightly cheaper to buy normal tickets Nagoya - Kyoto - Tokyo, however a JR Pass could be of good use if you plan to do additional travel, such as a day trip from Tokyo.

2.) The JR Pass is also good for local travel around Osaka, you can practically reach every important part in the city. The JR Pass can also be used on local trains around Nagoya but you'll be using the metro/bus much more frequently.

Hope this helps you :)
Daniel