Yes, walk-up bar seating is available at CG (which is, coincidentally, my favorite place to sit/eat in all of WDW). They are still using what used to be the the lounge area for regular tables (a change since reopening), but the bar is open.
I have had decent luck arriving right before opening (like 4:45pm) and getting our name added as soon as a CM gets at the 2nd floor check-in station. I’ve had not so good luck if I wait until later/more in the thick of dinner time. But being solo the odds should be with you, with any luck.
As PP notes, Citricos has the bar and small lounge and I agree the food is really, really good (CG has always held the top spot for monorail restaurants for me, but the new Citricos has really put CG on notice!).
I also agree with the PP to check the walk-up list in the app as an alternative to bar/lounge seating. Sometimes it’s full, but sometimes it works out well.
Have fun!