If you read the directions for making the borders, they have you piecing the borders, so when they say "cut strip" I am interpreting that you cut the strips the width of the fabric.
I personally do not like to pice borders, but I don't know if you have enough fabric to cut the needed border lengths as indicated in the instructions #5 & #6 for adding the borders.
5. First Border - Press to border
Stitch border pieces together end to end.
Cut into segments: 2 - 55 1/2”, 2 - 52”.
Stitch 55 1/2” pieces to right and left sides.
Stitch 52” pieces to top and bottom.
6. Outside Border - Press to border
Stitch border strips together end to end.
Cut into segments: 2 - 61”, 2 - 59 1/2”.
Stitch 59 1/2” pieces to right and left sides.
Stitch 61” pieces to top and bottom.