AMEX HIGH YIELD SAVINGS ACCOUNT

I know maybe this is not the right place to ask but other groups doesn't have that many members. I feel I love amex savings accounts but i feel to use the money it takes some days to be actually active, also it is not immediate transfers which makes me things about sn emergency what could i do? Should i just leave 1k in checking just in case? I love the amex high yield savings account tho but need more details about how to manage it