Creating a Table with Tkinter
As I suspected, there's already a thing for this - a TreeView. Strongly prefer built-in widgets that get the job done, leaving the construction of individual elements as a last resort if the built-in widget doesn't at all meet your needs.
There's plenty of examples on how to use this as a table, but if I were you I'd start with the reference documentation.
Remove the first row of your values and use it as a dedicated heading, instead. Break your i/j loop into two halves - a heading half, and a body half.