It is unlikely the shares were put to you just now.
But your account was just changed to reflect it, just now.
I have been a customer there since they bought it. They are always slow to change their system, whether it is account total, adding or subtracting symbols, especially in ticker changes, new options, etc.
I recall a disclaimer that option expirations and their effects may not be reflected until Mon. or Tuesday.
I complained about this for a decade and then gave up and took much of my business elsewhere. Good luck.