Starting to tile my shower and installed (tiled) the shower floor first should I grout the shower floor first then start tiling the wall or just grout everything at once....thanks

PS; What are your thoughts on using "grout boost" vs TEC XT

I have not personally used either of those products.
Sorry I can't help you.

I usually cover the floor tile and grout all at once, but that's just preference because then I'm, not mixing grout twice and washing tools twice. You can grout the floor first and cover it.

Thanks for the feedback it's appreciated