How far in advance should I get square jaw Botox before an important photoshoot?

I have a lot of photos to take next month, so I want to refine my lower face a bit, but I'm not sure when to schedule my square jaw Botox.
I thought that with Botox, you would see results immediately a few days after getting it, but I saw that it takes some time for the muscle size of a square jaw to decrease.
So I was wondering if receiving it just a week before the shoot was too late.
How long does it usually take after getting square jaw Botox for the lower face to look a little softer in photos?
I prefer a natural tidiness rather than a drastic change, but would it still be best to leave at least a few weeks?
Since first-timers don't know exactly how the changes will affect them, I think it would be more reassuring to get it done earlier rather than right before an important event.
I am also curious if there is any swelling or needle marks immediately after the injection.
I'm not the type to bruise easily, but since it's before a shoot, I feel like even the smallest mark will bother me for no reason haha.
If there is a specific time when the effects look the most natural, I would like to receive it at that time.
I am also curious whether you notice the difference yourself when looking in the mirror for the first time after getting square jaw Botox, or if it is more clearly visible in photos.
Since I see my face every day, I don't think I'll notice the subtle changes, so I'm thinking of taking a photo before the procedure.
For those of you who have received square jaw Botox before an important event like a photoshoot or a trip, how many weeks ago did you get it?
I am curious if you have ever experienced receiving it too early and feeling like the effects had already worn off a bit, or conversely, receiving it too late and not seeing much change yet.
Since it's my first time getting this procedure, I'd like to know the criteria for scheduling.