Is there a way in MacOS to view filesystem details, including cluster size, for an already created exFAT partition? I am interested in viewing the existing cluster size (aka allocation unit) and other FS details for an already created exFAT partition.  My attempts in searching, including here, have only led to answers about how to choose and specify what the cluster size will be for a newly formatted disk.  That has already been done, and I now want to view what was done.

I'd like to use anything available on my Mac, that is, not have to use any external software, including Windows.  If there's a command that shows this, all the better.

Thank you for your insights!
You can use either diskutil info ... or sudo newfs_exfat -N ... to get various (but different) details of your ExFAT file system:


Get the device list:

diskutil list

Choose the partition:

diskutil info diskXsY


Example:

user@host ~ % diskutil info disk1s2
   Device Identifier:         disk1s2
   Device Node:               /dev/disk1s2
   Whole:                     No
   Part of Whole:             disk1

   Volume Name:               Share
   Mounted:                   Yes
   Mount Point:               /Volumes/Share

   Partition Type:            Microsoft Basic Data
   File System Personality:   ExFAT
   Type (Bundle):             exfat
   Name (User Visible):       ExFAT

   OS Can Be Installed:       No
   Media Type:                Generic
   Protocol:                  PCI
   SMART Status:              Not Supported
   Volume UUID:               B44618D6-7DA7-35B0-BB27-C39785AA75F8
   Disk / Partition UUID:     7C734251-4E83-4537-885C-237D94F50633
   Partition Offset:          210763776 Bytes (411648 512-Byte-Device-Blocks)

   Disk Size:                 1.1 TB (1073530011648 Bytes) (exactly 2096738304 512-Byte-Units)
   Device Block Size:         512 Bytes

   Volume Total Space:        1.1 TB (1073495408640 Bytes) (exactly 2096670720 512-Byte-Units)
   Volume Used Space:         10.0 MB (9961472 Bytes) (exactly 19456 512-Byte-Units) (0.0%)
   Volume Free Space:         1.1 TB (1073485447168 Bytes) (exactly 2096651264 512-Byte-Units) (100.0%)
   Allocation Block Size:     131072 Bytes

   Read-Only Media:           No
   Read-Only Volume:          No

   Device Location:           Internal
   Removable Media:           Fixed

   Solid State:               Yes
   Hardware AES Support:      No

or sudo newfs_exfat -N diskXsY

Example:

user@host ~ % sudo newfs_exfat -N disk1s2
Reformatting existing ExFAT volume
Partition offset : 411648 sectors (210763776 bytes)
Volume size      : 2096738304 sectors (1073530011648 bytes)
Bytes per sector : 512
Bytes per cluster: 131072
FAT offset       : 2048 sectors (1048576 bytes)
# FAT sectors    : 65536
Number of FATs   : 1
Cluster offset   : 67584 sectors (34603008 bytes)
# Clusters       : 8190120
Volume Serial #  : 5ea31cc5
Bitmap start     : 2
Bitmap file size : 1023765
Upcase start     : 10
Upcase file size : 5836
Root start       : 11


Hint: the message "Reformatting existing ExFAT volume" is misleading; the file system won't be altered.
   From man newfs_exfat:  

-N      Don't create a file system: just print out parameters.