If you have connected Medium to Stripe (which you likely did when joining the Partner Program, as it is part of that process), the money shows up around the 6-8th of the following month and around that time, Medium will send you and email to say it's on its way. It usually lands in your Stripe account by the 8th.

Congratulations on earning some money!! Yay!!

I've just found your submission - thank you!! I haven't read it yet, as I'm in the midst of other things just now - but I noticed that you forgot to tag (with "@" symbol) at least one other writer, and share at least one of his/her stories.

Looking forward to reading the story you mentioned the other day!! Thanks for submitting it!!