Don't know your particular variety but that would appear to be ripe if the colour is correct on your photo. If so, then best removed and used in order that the plant can get on and produce more. If unsure whether fully ripe, you could remove and bring indoors for a couple of days.
It looks like a patty pan squash, which are also used just like courgettes. I harvest them at about 4 inches diameter - the skins can get a bit tough if left to grow larger than that.
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when they’re a bit smaller too if you like. 😊
If so, then best removed and used in order that the plant can get on and produce more. If unsure whether fully ripe, you could remove and bring indoors for a couple of days.