Sonixd Redux can display lyrics for the currently playing track, fetched from your server.
Click the Lyrics button in the player bar to open the lyrics panel.

The panel shows:
If your server provides synced lyrics (LRC format), the current line is highlighted as the song plays. Click any line to seek directly to that position in the track.

Use the zoom control in the lyrics panel to increase or decrease the font size for readability.
Lyrics availability depends on your server: