しばらく + [sentence] しばらくです(ね)
しばらく means "for a while": a stretch of time that is not short, but has no set length. It goes in front of the verb like other words of time, and the stretch can be a few minutes or a few months.
In shops and on the phone you hear the polite しばらくおまち待ちください, "please wait a moment".
With a negative, しばらく says that something has not happened for some time.
With は, しばらくは looks forward: things stay this way for now, and you expect them to change later.
These go beyond "for a while" in front of a verb.