The Possuk in Bereishis Chapter 24.63 says, “Yitchok went out to supplicate in the Field.”
The Baal Haturim says on that Possuk – to supplicate in the field – “he Sages said that it meant that Yitchok ordained Mincha – the afternoon Prayer. – And it was then that he met Rivka his wife to be. This recalls the verse in Psalms 32.6 – For this let every devout one pray to You at a time of finding.. That word finding refers to a wife as it is written in Proverbs 18.22 – who has found a wife has found a good thing.”
The Baal Haturim, I would suggest, is telling us that Mincha is a good time to pray for a shidduch.