They're there, but hidden. Grab an arithmetic block from the palette, e.g., a + block. Right-click it, and choose "Relabel" from the menu. Then you can change it into a MIN or MAX.
To apply the block to all the values in a list, drag the list over the arrowhead ︎ at the end of the block, so you see a red halo around it, then let go. The block name will change to MINIMUM or MAXIMUM and it takes the list as its only input.