In major cities and tourist destinations you'll find a lot of English signage, especially in airports, train stations, and hotels. Many restaurants, especially in tourist areas, have English menus or picture menus, making ordering food straightforward. Public transportation (trains, buses) typically offers announcements and signs in English.
Once you venture into rural areas or smaller towns, English becomes less common. Signs may only be in Japanese, and locals are less likely to speak English fluently. You may need to rely more on translation apps or learning a few basic phrases in Japanese to communicate effectively.
Keep in mind that Japanese are very polite and will often go out of their way to help foreign visitors, even if they don't speak English. People working in tourism tend to have some level of English, but understanding basic Japanese customs and learning a few words can enhance your experience.