Would it be all right if I visited tomorrow?

Literal

Tomorrow [humble-お伺いして] good [tentative-でしょうか].

お伺いしてもよろしいですか is a keigo permission request — layering humble 伺う with the permission pattern ~てもよろしいですか ('may I?'). よろしい is the respectful form of いい/よい. Highly deferential, suitable for business or formal social contexts.