100GW = around 250 million m³/day (roughly). We don't know the contracts and pricing details behind this flow of gas, but if you'd want to buy a megawatt-hour of natural gas for May delivery, you can find the most up to date prices here.
Some further background can be found in in this blog post.
Uzhgorod is on the Ukrainian border, and is also called Veľké Kapušany. The Yamal pipes are also called Mallnow, Jamal or Jagal. Nordstream meanwhile is also known as Greifswald in other tables.
As long as the EU storage withdrawal graph is positive, we are using up our reserves. Similar data but going back further in time and with prettier graphs & much more data can be found on this Bruegel page.
All data and scripts are on GitHub. Page by bert hubert, email@example.com or @bert_hu_bert.