Which way to turn ?

Thursday I had a minor morale decision. - The story is that on Tuesday I came across an elderly very poor black lady who - without her glasses, was functionally blind and she had broken her glasses months ago. I took her old glass lenses and said it would take about 10 days and I could find a frame and it would only cost a little to fix them. It turns out the the next day Yaakov found a frame and fixed them- So now- I have the glasses 8 days earlier than promised- It is 4 pm and I am done with my work. I can either turn towards home and make it to mincha with a minyon or turn towards Detroit and deliver the glasses and miss davening with a minyon. I could daven- Just not with a minyon. Do I turn towards home or Detroit. Does doing a chesed for a goy over ride davening with a minyon?. I decided to deliver the glasses. So far 3 people have said that halachicly I was wrong. My argument to myself as I was deciding which way to turn was that we are commanded to walk in the ways of Hashem and he does chesed for goyim. What do you think . Should I have gone to detroit or to a minyon. Im not looking for emotional answers- only halacha
Signed- confused in golus