I've used power on commutes when I had the pedals on so can use those efforts in the past, just couldn't see in GC where TSS is listed. My commute is flat and one direction with generally wind going the same way every day, so effort wise is easy in the mornings, slightly harder in the evenings, so would no doubt balance out.
Ah OK, didn't realise you couldn't see TSS, I have totally overlooked this sorry mate. Do this in GC:
Tools > Options > Metrics tab > Summary Tab
On the left you have "available metrics", on the right you have "selected metrics".
Select the following metrics from the Available on left - TSS, IF, NP - then click on the right arrow in the middle of the window to shift them over to your selected metrics pane.
Hit Save.
Now when you select an activity in GC, up the top on your summary tab you will see the headings as Totals - Averages - Maximums - Metrics - Model...... Underneath the Metrics heading on the summary you should see your CTL, ATL, TSB, RR, TSS, IF, NP for the selected ride = job done!
FYI, in my selected Metrics pane I have TSS, IF, NP, Estimated VO2 and Left/Right Balance as I have Garmin Vectors so it is handy.
Let me know if that works ok and my instructions are clear enough, but that will allow you to see your TSS and NP etc for any ride on the summary screen when you select it in activities tab
Edit, screenies -