I don't know what's the best way but here is _a_ way:

set the range of a horizontal slider to match the length of the array
you can use the outlet of soundfiler and send it to the [hsl] object's receive symbol through a message, for example: 

[soundfiler]
|
[range 0 $1(
|
[s myslider]

(it will only update whenever you load a file)
then you can take a [line] (no tilde) and send it exactly the same messages as the [line~]   you use for playing the sound (unless you are using a phasor~ for that...), and have it control the slider. 
place the slider under your array to serve as a readhead
I did something similar in this patch:
http://www.timvets.net/software/pd_beatslicer.php?page=software
in the video, the yellow slider on the top left follows the sections of the array being played
gr,
Tim

2010/5/17 PF <potaxpotax@gmail.com>
hi
what's the best way to visualize the elapsed time and current position
while playing a sound file from an array?

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