Synonyms for Up to now:

adv.

already (adverb)
heretofore.
yet (adverb)
hitherto, so far, until now, as yet, thus far.

n.

up to now (noun)
hitherto, yet, Til Now, as yet, until now, thus far, to date, heretofore, so far.

Other synonyms:

til now
Til Now.
Other relevant words:
yet.