[Grammar] The future: a time clause?

[Mannysteps]

If no Time clause is added:

"I'm working", "I'm going to work.", "I will work"

Independently of the individual nuances all seem, to me, addressing the present. While:

"I'm working tomorrow.", "I'm going to work tomorrow.", "I will work tomorrow"

Clearly address the future. Is the future down to a complementary time clause, then?

 

[5jj]

Without more context, we cannot say precisely what time periods the speaker is talking about in:
"I'm working", "I'm going to work.", "I will work".

Words have meaning only in context.

 

[Mannysteps]

Thank you Fivejedjon, you are always most helpful:

"I'm working today", "I'm going to work today.", "I will work today."

"I'm working tomorrow", "I'm going to work tomorrow.", "I will work tomorrow."

My question still stands.

 

[5jj]

My question still stands.

So does my response: Words have meaning only in context.