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Howard
I usually support the plasterboard
around all the edges with some ply or something to stop movement - which can end up cracking.
Also any movement in the board can allow a ridge to form when you’re skimming.
Edit; Is the left side cut back to the next stud? In which case after some glass tape and screws both sides of the vertical joins -you’re good to go.
The original hole was at the large end of what is suitable for a California Patch which is a quick and cool way of patching holes in PB.
You square up your hole, cut your patch about 100-150 mm bigger, score the back to the size of the opening then snap and peel off the excess pieces. This leaves you with a patch with an overlapping front face of paper which you then just stick in place with plaster and skim over.
It’s kind of hard to explain.
https://youtu.be/17awCvAA7Q0
I was shown how to make them by a hippie plasterer in California- 😎