Typically flooring gets installed after cabinetry.  But it depends on your flooring type.  If it is a floating floor (luxury vinyl plank, laminate or engineered wood) this will go in after cabinets because it needs expansion gaps.  If you have a glue down product (some vinyl plank, sheet vinyl, solid wood, tile), this can go before cabinets.  Talk to your flooring provider about install, they can discuss the manufacturer requirements.