Moving from LCW to LCWRA

Hi I've just gotten moved from LCW to LCWRA and I'm confused, so after some help please.

I have been on LCW for a few years now.

I declared new health issue 18th October 23.

DWP sent me out a new WCA form which I filled in and returned in 02nd December 23.

My GP filled their form in in January 24.

I received a letter in my online journal stating I have moved from LCW to LCWRA as of today (08/06/24).

My payment date is 18th of each month (12th -11th).

Can somebody please explain what this means in simple terms?

Also when will I receive my first LCWRA payment?

Will it be back-dated?

Any help appreciated