A question about a recipe: Kale with Pancetta, Cream and Toasted Rosemary Walnuts

I have a question about step 5 on the recipe "Kale with Pancetta, Cream and Toasted Rosemary Walnuts" from apartmentcooker. It says:

"In a large bowl, toss the walnuts with the olive oil well to coat. Add the rosemary and fleur de sel and toss well to combine. Transfer the walnuts to a baking sheet and toast until fragrant, about 8-10 minutes. Cool slightly, and roughly chop."

What is oven temp.? Thank you!