I was looking for Citi costco actually and get invation for CitiCash because marrige surname change just happend 2 mnonths ago i was nervous but on spot 4.5k approval and $200 rewards on first $750 spending.
Citi hard pulled transunion only for now,
Now how long to wait for applying citi costco
I read others say citi do not convert card to each other and because citi cash is Master can not be used at costco 
What to do for citi costco Wait how long ?
my scores approx
TU : 770
EQ : 750
EX : 800
Cards
Tdcash 2k discover 1k capital 500$ (rediclus should i cancel)
amex 4k FB&T 4k (ex barclay) Synch/ebay 9k authorized user on spouse
Hards 4 TU others EX EP has no hards and only shows TD card very weird
Edit : Just read
UGGHH OHHH : Credit Karma ref is $300 on 3 months and 1k spending ( Gone bye bye $100 bucks
Congratulations on your Citi approval! I would recommend waiting at least six months before applying for the Costco card.
Grats on the Citicash approval 
Congrats on the new Citi card!
"...and because citi cash is Master can not be used at costco"
Congratulations! Even if this was a VISA it isn't the best card to use at Costco because warehouse stores aren't a 5% category. I found incidentally that Costco purchases coded as groceries when ordering through Instacart (at least on my Amex BCP).
