Is it correct to say "peace, mercy, and blessings of Allah Almighty be upon you" (السلام عليكم ورحمة الله تعالى) and "Glorified and Exalted be He" (سبحانه وتبارك وتعالى)?

The word "Ta'ala" (Exalted be He) is correct and permissible when informing about Allah, and it is mentioned in the Holy Qur'an. It is a good praise for Allah the Exalted. However, adhering to it always in salutations should not be done due to lack of authentic proof, and it is better to restrict oneself to what has been authentically reported.