Can sprouts soak for a few days?

I’m about to start my first grow, outdoors. I put two seeds in water yesterday, and ordered a pH tester that I thought would be here overnight, but it won’t be here until Wednesday, and today is Monday. One of the seeds has already stuck out the tip of a root.

My question is: rather than putting them in soil, while waiting to be sure my garden’s pH is ok, can they hang and sprout in the water in a dark place for three days?

If they have a taproot plant in solo cup with drain holes buy a gallon of ro water if needed no ph with ro