My uncle was commuting each day is also correct and added, thank you.
You are correct that it is in the imparfait which is used for a repeated action in the past tense. Depending on the context it can be translated in the past continuous (was + verb+ing) or the simple past in English.
FYI, in English "commute" may also mean change (eg a material into another by processing it) or exchange (eg a punishment, a type of payment).
Cambridge dictionary examples:
- People used to believe that you could commute base metals into gold.
- I think I'll commute my life insurance into an annuity.
- Her sentence was commuted from death to life imprisonment.