DHCP relay on layer 2 switches

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This may be a simple question so I hope someone can help.

We have several Cisco SG300\500 switches in L2 mode. Each switch has 8 VLANS and VLAN 1 is still native (For now). We do all routing between VLAN's on our firewall.

After reading several other posts, they were saying you don't need to set up DHCP relay and helper addresses on L2 switches. The firewall will do it all. Is this correct? If so why, and in what circumstance would I need DHCP relay\helpers on L2 switches.

All of my switches have 1 SVI on my management VLAN and the IP default-gateway set.

Any help is appreciated.

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