Q. During his Hesped for Horav Chaim Kanievsky zt'l, Horav Itzchok Zilberstein Shlit'a mentioned that whoever takes part in that most important Levaya and davens to Hashem in the Zechus of the great Tzadik and Godol BeYisroel, the Tefilos will be granted. Does that apply also to the ones who were zooming the Levaya on the other side of the world.
A. Horav Shlomo Miller’s opinion is that it does as it was after all an 'Eis Rotzon', or an incredibly great time of good will from Hashem.
Horav Dovid Pam Shlit'a added that it is similar to the one davening at home, that Poskim recommend to do so at the time when the Tzibur davens.
(See questions 3119 and 2721 that although a Zoom group does not create a minyan and one does not even have to answer amen to a brocho recited by that media, for some purposes such as a Seudas Mitzva and a siyum, it is effective).
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit'a