From the Pixel 4 to the Pixel 6 line, the Google Pixel June update is now available for those with still-compatible devices. This month is a Pixel Feature Drop month and includes several new features for Pixel devices. Also included are security patches and bug fixes.
Now that Google has released the June factory image for all active Pixel phones, including the Pixel 4, Pixel 4a, Pixel 5, Pixel 5a, Pixel 6, and Pixel 6 Pro, it has released the OTA 12.1 files as well. All updates for the Pixel 6 lineup will be available on time this month, according to Google. Google should begin distributing these updates shortly (Settings > System > Advanced > System Update)