ls -lah /boot

# contents of /boot/ after latest "apt update && apt upgrade"
# (following a 100% fill of /boot and then clearing out old kernels
#
# Date: 2023_04_05

┌──(root㉿kali)-[~]
└─# ls -lah /boot
total 162M
drwxr-xr-x  5 root root 3.0K Apr  4 13:32 .
drwxr-xr-x 19 root root 4.0K Apr  2 21:01 ..
-rw-r--r--  1 root root 253K Feb 23 13:59 config-6.1.0-kali5-amd64
-rw-r--r--  1 root root 253K Mar 22 13:16 config-6.1.0-kali7-amd64
drwxr-xr-x  2 root root 1.0K Jul  8  2022 deprecated
drwxr-xr-x  6 root root 1.0K Apr  4 13:29 grub
-rw-r--r--  1 root root  72M Mar 25 18:35 initrd.img-6.1.0-kali5-amd64
-rw-r--r--  1 root root  74M Apr  4 13:30 initrd.img-6.1.0-kali7-amd64
drwx------  2 root root  12K Jun 13  2021 lost+found
-rw-r--r--  1 root root   83 Feb 23 13:59 System.map-6.1.0-kali5-amd64
-rw-r--r--  1 root root   83 Mar 22 13:16 System.map-6.1.0-kali7-amd64
-rw-r--r--  1 root root 8.2M Feb 23 13:59 vmlinuz-6.1.0-kali5-amd64
-rw-r--r--  1 root root 8.0M Mar 22 13:16 vmlinuz-6.1.0-kali7-amd64


# Note that /boot is a separate partition
┌──(root㉿kali)-[~]
└─# df -h /boot/
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb1       462M  176M  258M  41% /boot