Last time I went to BCN it was pre covid. I do think however their check in desk is open all day with flights at 0700 1015 1300 1730 1830 1950 and sometimes later or thereabouts, . Even if it did close it would open not long after 1000 with a departure at 1300.

The Priority desk were quite polite and helpful offering to check my case in free as I was HBO and apologised for not being able to put me on an earlier flight, I didn’t want or ask for thst.