Hi,
At the moment Sailfish X is officially available for these devices:
Sony Xperia 10 Single SIM (I3113 & I3123)
Sony Xperia 10 Dual SIM (I4113 & I4193)
Sony Xperia 10 Plus Single SIM (I3213 & I3223)
Sony Xperia 10 Plus Dual SIM (I4213 & I4293)
Sony Xperia XA2 Single SIM (H3113 & H3123 & H3133)
Sony Xperia XA2 Dual SIM (H4113 & H4133)
Sony Xperia XA2 Plus Single-SIM (H3413)
Sony Xperia XA2 Plus Dual-SIM (H4413 & H4493)
Sony Xperia XA2 Ultra Single-SIM (H3213 & H3223)
Sony Xperia XA2 Ultra Dual-SIM (H4213 & H4233)
Sony Xperia X Single SIM (F5121)
Sony Xperia X Dual SIM (F5122)
Gemini PDA variants x25 and x27.