More or less similar to older switch models
Copy the bin file to your switch and then copy it to all the other switches in the stack’s flash. IE flash 2,3,4 etc.
Then
conf t
boot system switch all flash:file name.bin
end
wr mem
show boot
Show boot is just to verify the boot statement is correct across the cluster. Make sure you have a good config backup per good operating standards before upgrading. Saves headaches in case something goes wrong. Murphy is watching!