hey trike,
With your plants as far as they are I wouldn't worry too much about pollination. Even if the plant managed to get some small amounts of pollen you would most likely only see a couple seeds from it.
It is true that a male plant in the neighborhood can definitely pollinate many in the area, both by air and by various bugs, but that's an unavoidable problem with outdoor...I don't see it diminishing your yields and just keep giving tlc till the end.
It's normal for the plants to have their growth slow down at this time, as long as the buds are still developing and maturing and bulking up.
Happy flowering.✌️