There is an option to display current status of tmux continuum in tmux status
line. This is done via #{continuum_status} interpolation and it works with
both status-right and status-left tmux native options.
Example usage:
set -g status-right 'Continuum status: #{continuum_status}'
When running, #{continuum_status} will show continuum save interval:
Continuum status: 15
or if continuous saving is disabled:
Continuum status: off