starstruckplans

This will of course work for the sample posted though it would still be great to see the addition of a 'Create Trim Marks from Rectangle' option which Illustrator has had forever so it could be used where you have multiple artwork on the same canvas all requiring crop marks...

If you activate Registration Marks you'll get auto-centred marks which you can easily use as Crop / Cutting Marks.

@starstruckplans, welcome to the forums...
As far as I know, it's not currently possible to add centre crop marks so I would set a vertical guide to the relevant position and just add two manual crop marks using the pen tool...