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You can use or threaten non-deadly force anytime of the day to stop a burglary in progress.

There are too many variables to say conclusively, but assuming I scan the area and only see 1-2 actors (my back to the store, restaurant, or house with no way to get ambushed from behind):

I'd call 911 and let them know it as soon as we're connected and I start giving their descriptions. I plan to hover my hand near my firearm but keep it concealed.

If their aggression turns towards me, we have a new threat to analyze as it is now a crime against a person instead of against property.