How to confirm if FileVault encryption has fully completed How to confirm FileVault encryption has fully completed? While it's in progress, diskutil apfs list | grep 'Encryption Progress' ; fdesetup status will shows percentage of conversion.

Later is there any way to know 100% encryption is completed?
APFS volumes
It seems that the only way to tell for APFS volumes is to use fdesetup status. This fantastic blog offers a script which basically uses that command to determine the status. In the article it reads:

If encrypted, the following message is displayed:
FileVault is On.
If not encrypted, the following message is displayed:
FileVault is Off.

These are basically the outputs of fdesetup status.
Non-APFS volumes
For non-APFS volumes there is more information. Try diskutil cs list or diskutil cs list | grep &quot;Conversion Status&quot;, respectively and look for Conversion Status. See also the accepted answer here.
$ diskutil cs list

CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group XXX-XXX-XXX-XXX
    =========================================================
    Name:         VolumeXY
    Status:       Online
    Size:         196521975808 B (196.5 GB)
    Free Space:   0 B (0 B)
    |
    +-&lt; Physical Volume XXX-XXX-XXX-XXX
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk2s2
    |   Status:   Online
    |   Size:     196521975808 B (196.5 GB)
    |
    +-&gt; Logical Volume Family XXX-XXX-XXX-XXX
        ----------------------------------------------------------
        Encryption Type:         AES-XTS
        Encryption Status:       Locked
        Conversion Status:       Complete
        High Level Queries:      Fully Secure
        |                        Passphrase Required
        |                        Accepts New Users
        |                        Has Visible Users
        |                        Has Volume Key
        |
        +-&gt; Logical Volume XXX-XXX-XXX-XXX
            ---------------------------------------------------
            Disk:                  -none-
            Status:                Locked
            Size (Total):          196169654272 B (196.2 GB)
            Revertible:            Yes (unlock and decryption required)
            LV Name:               SD
            Content Hint:          Apple_HFS