Everybody likes certainty and consistency. Me too!
Unfortunately, I have no idea how any guide book author could credibly offer it to you. I walked the Frances in the fall. Some places were shut down due to Covid. Some were opened up and running unchanged from previous years. Many had reduced capacities. There were fewer pilgrims than previous years, but it was largely the same experience as it has always been, including tour groups after Sarria. There were fewer communal meals, but some places still did it. Many bars had reduced seating capacity, but there was always somewhere to eat. A few towns between stages had no open bars anymore, but this was more of an inconvenience than a hardship.
It's all a moving target. The Camino infrastructure is bruised, not destroyed. It will recover as the pilgrims return, one location, one Bar, one albergue, at a time. As it was in October, all was perfectly well in terms of finding services. Can I suggest that rather than using a printed guidebook written by a presumably clairvoyant author, check Gronze.com as you walk, which is updated frequently. It was all I used, and it worked perfectly.
As for masking, social distancing, standards of practice, etc. - when in Rome, do as the Romans do - is the best plan. I was chided in several towns by locals for not wearing a mask on the streets. In neighboring towns, people were wearing them only indoors. The rules are slightly different between Galicia, Navarre, Casitlla y Leon, and Rioja, and they change at different times. No big deal, every hospitalero and barman would point out the local rules if we broke them, with a smile. It was all very calm. There was no uniform standard. Go with the flow.
Buen Camino