Student or Learner
Both the persons have not come to office till now.
Both the persons have not come to office upto now.
Both the persons haven't yet come to the office.
Try here § 284. till / until. 3. Word Choice. The American Heritage Book of English Usage. 1996 and World Wide Words: Until, till and ‘til, and test your knowledge here Till vs. Until
up until. The Columbia Guide to Standard American English. 1993
up until is a compound preposition that means the same as until, as in We can stay until [up until] Thursday. Limit it to Conversational and Informal and Semiformal use, and let context make clear the relation (if any) to bedtime; until by itself is more appropriate in most Edited English.