Website to visualize your squads turn order

You are right. It was visualized on swgoh.gg with what is now labeled as "Squads (old)".
Example: https://swgoh.gg/squads/old/101328/
They dropped it with their new "Squads" function in favour of prominently showing the toon speed below the chars: https://swgoh.gg/squads/136181/

I have no information on that change but I could imagine they dropped the visual chart because TM progress is extremely volatile (depended on opponent's team composition, prone to evasion and resists) and cannot be predicted in a serious way. Keeping that in mind it makes sense to drop the chart and just show the initial - untampered - speed of your own squad.

Try swgoh life

Sounds like the squad builder on swgoh.gg

Toon like Vader (and as vksg pointed many other toon/situation in game) makes this thing basically unpredictable.