You're not going to have much success taking clones from a plant near the end of slowering. Before using mothers I took cuttings from flowering plants when they were 2 weeks into flower. As an experiment I also took some at 3 weeks, 4 weeks and 5 weeks. The ones taken at 3 weeks were OK. The ones taken at 4 weeks had lower success and the ones at 5 weeks lower yet.

I don't know your cloning method but rooting time should be the same whether from Flowering plant or mother. Mine root in 6 to 10 days either way. If you go 14 days without roots odds are they are goners.