Can't comment on your non-compete without reading it. There is nothing "standard" about any of them.

However, your employer can fire you for any reason or no reason at all as long as it doesn't violate any anti-discrimination laws.

Even if you aren't "breaching" the non-compete you can still lose your job if your employer doesn't like you moonlighting.

Best thing I can suggest is tell your employer that you want to do this on your own time and get his consent.

But if you have reason to keep it a secret from your employer in the first place then your risk of getting fired is greater if he finds out and that has nothing to do with the terms of the non-compete.