Hi @drobles
I have designed a sample flow that will run on daily basis and extract the in-progress and completed tasks from planner and publish them to teams channel:
1. Set the schedule to run daily and use List tasks action to fetch all the tasks:

2. Next, filter the result to get in progress and completed tasks using percentage complete property:

3. Now, format the result obtained from filter array action:

expression used for if condition:
if(equals(item()?['percentComplete'],50),'In Progress','Completed')
4. finally, post the html table to teams channel:

I hope you have got some idea on publishing planner tasks information to teams channel.
If this helps, please remember to give a 👍 and accept my solution as it will help others in the future.
Thanks