Hi Sharminee,
The eyes should be opened at least some by now. But it depends on when you started hand feeding it. They do not develop as quickly when being hand fed. If the eyes were opened and seem closed again, a respiratory infection can cause something like that. I’ll give you a link to pics showing rosellas chicks developing – these were being parent fed.
http://www.opalhut.com.au/ausopals/eastern_rosellas/eastern_rosellas.html
If your little on seems to be really behind compared to these, you might think about taking it for a Vet check.
Thank you for Asking Lafeber,
Brenda