Learn Turkish: O her zaman çalışıyor.

It translates to both! Her means "every" and zaman means "time". Together, her zaman is the standard Turkish phrase for "always". Notice that it acts as an adverb on its own and doesn't need a time ending (like the -ta you would use when answering saat kaçta).

Why does the verb use the -iyor ending (is working) if "always" describes a regular habit?

In English, we usually say "He always works" for a routine, though "He is always working" is also correct. In Turkish, the present continuous tense (-iyor) is very commonly used for everyday habits and routines, not just actions happening right this second. So çalışıyor covers both "works" and "is working".

How do we know o means "he" here? Could it mean "she"?

Yes, it absolutely could! Turkish doesn't have gendered pronouns, so o can mean "he", "she", or "it". The provided translation uses "He" simply to give you a complete English sentence, but in a real conversation, context will tell you who is being talked about.

Where do time expressions like her zaman belong in a sentence?

Time expressions usually go right after the subject and before the object or verb. This gives us a very typical Turkish word order: Subject (O) + Time (her zaman) + Verb (çalışıyor).