hariç is a postposition meaning “except (for), excluding” and follows the noun directly:
It harmonizes as -dık, -dik, -duk, -dük. With 3sg possessive, you’ll see -dığı, -diği, -duğu, -düğü. Examples:
Yes, a comma can separate two closely related independent clauses in Turkish. A semicolon is also fine for a stronger break. You could also write two sentences or add a linker:
Optional. With short fronted adverbials, many writers omit it: Ara hariç her şey…
Adding a comma (Ara hariç, her şey…) simply marks a pause/emphasis; both are acceptable.
You can also use mola. Both are common in meeting contexts: