I gave my promo code to a neighbor and she booked multiple walks with me. When will I see the referral money in my account?

I gave my specific promo code to a neighbor and she booked multiple walks with me. This referral code gave her $20 off her first booking. When will I see the money for the referral in my account? Will I receive $20 for the referral?

As a note these walks are future walks, they have not been completed yet.