would both make sense?
No. You cannot use zurzeit here. You'd use Bis jetzt... which corresponds Until now.
Zurzeit denotes a current state, similar to derzeit, aktuell, momentan, im Moment, gerade, jetzt
One difference between these is the usual period of time, this state continues. For instance in the two sentences
Ich lege gerade einen Garten an.
Ich lege zurzeit einen Garten an.
the first one is about, that you are working on right now while in the second case, you are talking about a project which may take some days or weeks and you're not necessarily working on it right now.
The second point is, that such a state may change sooner or later. How it is understood usually depends on what you're talking about.
Zurzeit schreibt sie selten Emails.
Maybe because, she currently has little time or whatsoever, but that state won't continue forever.