Separate the plants now and clone your girl.

When the male is ready you can harvest the pollen and pollinate the lower parts of the plant. Leave the top parts to flower for better smoke. Use the low parts that don't get as much light to produce your seeds.

There are many step-by-step books and info online how to collect pollen. It does not store well and for very long but you only need a little. You should turn off your fans while you collect and distribute the pollen btw.