SAN FRANCISCO — The final stop of the offseason will take place on Saturday, when Willy Adames, Heliot Ramos and others meet fans in Sacramento as part of the FanFest tour. When that’s over, players will next be seen at Scottsdale Stadium, but the Giants still will have another week or so until pitchers and catchers report, and Buster Posey intends to try to use it.On a Zoom call to discuss the addition of outfielder Harrison Bader, Posey said the front office still could look to make upgrades to the roster. But he also said he likes the group they have put together thus far. “We’re excited. There’s definitely a lot of excitement on our end,” Posey said of the offseason. “A couple weeks out, we still have some balls in the air here and we’ll see how it pans out. There’s nothing guaranteed but we’ll keep working.”With Bader in center field, the only place to upgrade the lineup would be second base, and the Giants have had extensive trade talks with multiple teams throughout the offseason, especially the St. Louis Cardinals, who have dangled Brendan Donovan. But the Giants also do have Casey Schmitt,...