Your error message describes the type you are failing to initialize properly: "is not an expression of type pair (map address mutez) (map address timestamp)".

First you need to specify each map with braces { }, and every element inside the braces begins with an Elt and is separated from other elements by a semi-colon. In your case you only have one element per map so you don't need any semi-colon.

You would use the following,

--init 'Pair { Elt "KT1address" 1 } { Elt "KT1address" "2019-06-09 00:00:00" }'

if you were initializing each map with 2 elements, it would look like,