Reducing size of pine wood

Hello all, I am building my first workbench.

I am an amateur in woodworking but I have all the willing to learn new things.

The table top is plywood 40mm and I want to cover the edges with solid wood pine tree. The dimensions of the table is 2000mm X 550mm

The dimensions of pine wood I find at my local shop is 45x45 mm so i need to reduce those 5 mm to be flush with my table top.

What is the best way to do it?

I am thinking

1) buy specific handsaw and do it 2) buy Electric planer and do it 3) use my edge router I have.

What you guys think?

Thanks a lot in advance.