Because this is a standard "WEB-DL" release, most subtitle files (SRT format) labeled for the Netflix version will sync perfectly. You can find them on major subtitle repositories:

A popular alternative where users upload subtitles in various languages specifically timed for this release.

Often best for hearing-impaired (SDH) versions and multi-language support. Movie Synopsis

both files in the same folder and play the video using a player like VLC or MPC-HC , which will automatically detect and load the text.

Set in 1925 Montana, the film follows a charismatic but volatile rancher, Phil Burbank (Benedict Cumberbatch), who wages a war of psychological intimidation against his brother's new wife (Kirsten Dunst) and her son (Kodi Smit-McPhee)—until long-hidden secrets come to light. Quick Technical Tip

the subtitle file to match the video file name exactly (e.g., The.Power.of.the.Dog.2021.srt ).