If the element Iron is only made before a supernova how are elements past iron made?

During a powerful enough supernova, the core will Collapse with extreme pressure and force. This causes a lot of heat and force, allowing atoms to smash and fuse to form heavy elements. The heaviest possible element is lead. Lead absorbs the energy (like iron) and cools the plasma.

During the moments of the actual supernova explosion itself. The pressure wave coming up from the core of the star is so intense that it briefly allows the fusion of elements heavier than iron in the layers above the star's core.

They are synthesized during the supernova itself, when the outer layer collapse and compress the core way past the temperature that allow fusing past iron.

Elements heavier than iron are formed in the s- and r-processes (slow and rapid neutron capture) that occur in a supernova explosion.

The pressures DURING the supernova are high enough so that all the natural elements with atomic weights greater than nickel (radioactive nickel isotopes become iron) are created by nuclear fusion processes during supernovae.

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