Yeah this is a pretty good momentum just depends on how Barcelona performs in this match. Bilbao is not a club to be underestimated especially when trying to do defensive schemes so Barcelona must try their best to make the match favorable for them in this match.
The first 30 minutes of the match were a bit monotonous as both clubs were still rotating in midfield and there were very few chances even though Barcelona were still trying but in this match I think Bilbao have kept up with their game and played calmly so far.
If things like this continue to be allowed I think it could be a little inconvenient for Barcelona because their target is 3 points but it is very difficult to get good attacking momentum because of the accumulation of Bilbao players in defense.
The first half will most likely be a draw if in the end things like this continue.
You're right, the game so far hasn't been very attractive although I think Barcelona have had some good chances to score. However, Barcelona really had to pay a heavy price in this match because during the first half their two best midfielders De Jong and Pedri had to suffer injuries. Of course this is a big loss for Barcelona who will face Napoli in the second leg of the Champions League, but the most important thing today is that they have to win their away game after Real Madrid and Girona dropped points.
The first half was not very interesting because both teams had minimal chances, but Xavi had to do something in the second half so that his team could create more chances. A win today is mandatory and Barcelona must try hard to make it happen, otherwise they really have to let Real Madrid and Girona stay ahead.
Well, as discussed earlier Barcelona let the situation unfavorable for them for too long which made the match in the end a situation that they could not overcome which made the match that they should have been able to get full points instead it did not end well as they only won 1 point in this match.
Their possession of the ball Barcelona was very good in the match in this match but in terms of opportunities this became a monotonous match in the end because Barcelona could not get a good chance even Bilbaou who only had a possession of 39 percent could keep up with them in terms of opportunities.

Even though this is a pretty good opportunity for Barcelona especially with the draw that Madrid got and Girona's defeat in the previous match, this should be maximized well but unfortunately in the end they also did not get full points in this match.